Injector issue with 1990?

[cp1joel]

Hi all,

I own a RHD 1990 ZR1 here in Brisbane, Australia.

It has had some work done to it, reground camshafts, and new headers. Also I recently installed a calibration chip by Marc Hailbeck. Car has 20k Miles.

Before I installed the chip, the car was idling high, hesitation followed by a massive surge of acceleration. Also was difficult to start when the engine was warm.

Hats of to Marc, very impressed how much his chip sorted out the idle and acceleration problem.

Anyway to the problem. The car is great when cold, but after it warms up there seems to be an issue. After coming to stop - start highway traffic, the cars Idle was becoming erratic. More so when travelling very slowly, clutch in, out etc. Feels as though it is going to die and running rough but doesn't drop below 900 RPM. Once the traffic cleared, I noticed that it was lacking power. Once I got up to highway speeds the power seemed to come back and was back to normal.

Seems to be a bit of shaking in 3rd gear with WOT.

Also the car has a very noise flywheel, which was becoming very apparent when idling, moving slowly. According to Marc, he believes this is an injector issue which is causing an imbalance.

Would appreciate some help with this. Would be great to finally getting the car running great.

note - the injectors were replaced a couple of years ago.


Regards

Joel