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Ruff idol, won't run past idol without the engine dying. 90 Corvette

 
JW72
I love my Chevy Chevette!
Posts: 21
Joined: 03/14
Posted: 03/20/14 12:22 PM

Ruff idol, won't run past idol without the engine dying.  Rev engine, engine strains to increase rpms.  Like there is a loss of horse power or no horse power.  Reaches 1,500 rpm, tries to die, pump the throttle to keep the engine running.  Engine has a noticeable miss at idol and rpms.  

Driving is limited to 1,500 in any gear, more rpm and engine dies.  Mechanic looked at the Corvette, "Its either the CPM or the distributor", he could not check either or didn't want to.  No error codes, nothing to indicated that anything is wrong.

Where to start as there are so many areas that could cause this problem.  CPM does have an after market chip.

I do have many, many years of being an expert shade tree mechanic, like to do my own repairs.

JW  
Retired, raced Corvettes in SCCA for 20 years. Own a 1990 Corvette and a 1979 Corvette.

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