I have a '87 C4 Coupe that I have owned for some 27+ years. Over the years I have made a few performance enhancements. Recently the car had begun to idle roughly and chalk up a "SES" light. With high mileage on the car I decided to make some maintenance parts service and upgrades. I installed a new IAC (Idle Air Control) unit, a Granatelli Adjustable MAF sensor, DUI Performance distributor, double roller timing chain, new spark plugs, and last but not least, Accel 24-lb Injectors. (I think 21or 22-lb were standard.) The car has had a Hypertech G2 early series power chip and Vortex air intake system with K&N filter on it for years. I still get a little rough idle and worst yet is when I shower down on it underload it seems have a pre-detonation or other misfiring sound and hesitation going on. Wondering if the early series power chip is not cut to work right with the new higher injector flow rate. Is there a later edition chip that would be recommended for the new injectors or what?
Submitted by: LD
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