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Chevy 350 missing

 
bigdee2
V-6 Camaros rule!
Posts: 55
Joined: 12/10
Posted: 10/07/12 04:51 PM

Any suggestions on narrowing down the issue(s) when the engine sputters for a brief second when you get on it and try a hard acceleration?  

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 10/07/12 07:03 PM

Heay bigdee2:

Give use some information. What color is the car, ash tray full something?...LOL... Confused  Grin  Cool

Help us narrow your problem down a little!!! Confused

Please help us a little!!!
year/make
type
car/truck
trans
manual/automatic
last/tune up

Bob  

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 10/07/12 09:01 PM

my first blind guess is lean stumble  
68scott385 68scott385 68scott385

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waynep71222
I have an SS396 tatoo
Posts: 448
Joined: 03/12
Posted: 10/07/12 09:28 PM

yep...  

 idle transition circuit..

accelerator pump circuit..

secondary air door opening way too soon...

not enough torque converter stall speed for the size of the cam you might have..  

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bigdee2
V-6 Camaros rule!
Posts: 55
Joined: 12/10
Posted: 10/08/12 05:32 AM

69 Chevelle
turbo 350
Lunati Cam  262/268     219/227 and .468/.489
Edel EStreet Aluminum Heads
Edel 750 cfm carb
Stock stall converter
headers  2.5 duals
Hei dizzy
RPM Air Gap Inatke - Edel  

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Pontiacman2
Moderator
Posts: 8956
Joined: 09/08
Posted: 10/08/12 05:53 AM

Have you tried adjusting the accelerator pump??  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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68scott385
I mow my lawn and find Chevys
Posts: 1994
Joined: 10/09
Posted: 10/08/12 08:36 AM

Eddy AFB carb says it all

the 750 comes out of the box with the pump rod at the richest setting

change orange 5inhg step up spring to the (forget color) 3inhg step up spring

change the pump nozzles from the factory 28s to the larger 42s

if these changes don't fix the problem then it's time to start changing rod/jet combos  
68scott385 68scott385 68scott385

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 10/08/12 09:19 AM

Bigdee2:

Set your base timing at 10*to12*.

Then set your total timing at 32*, and have it all in at 2500 RPM. See it that helps. If you set more base timing then set it.

See if that helps that stumble out of it.

Bob  

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MarkIV396
I love my Chevy Chevette!
Posts: 1
Joined: 01/10
Posted: 10/10/12 07:06 AM

I'm still running original (rebuilt) distributor in my L48 350. Mine will do that when the points start going away. New set is fairly cheap, so I throw another set in there apx. once a year. Motor is now in my '70 C10 w/240K on it. Still runs like a bat outta hell!  Laugh  
(2) '65 IMALA SS
(1) '68 BISCAYNE 502
(1) '70 C-10 L48
(1) '82 CAMARO L48
(1) '98 MONTE CARLO
(1) '50 PACKARD 8

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skyeking
I mow my lawn and find Chevys
Posts: 2738
Joined: 08/09
Posted: 10/10/12 06:02 PM

Hi there,
If you have points and you want to fine tune the motor then
set No 1 piston @ TDC and turn a mobile radio on full BETWEEN
stations and turn loose but firm dizzy so that you hear a steady
crescendo of sound building up to the a loud whack..lock it up
and send it home.  there you have it....Skyeking..  
skyeking

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skyeking
I mow my lawn and find Chevys
Posts: 2738
Joined: 08/09
Posted: 10/10/12 06:02 PM

Hi there,
If you have points and you want to fine tune the motor then
set No 1 piston @ TDC and turn a mobile radio on full BETWEEN
stations and turn loose but firm dizzy so that you hear a steady
crescendo of sound building up to the a loud whack..lock it up
and send it home.  there you have it....Skyeking..  
skyeking

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