Normal or bad ECM
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Car: 89 Iroc-z
Engine: 5.7 lt
Transmission: 700r4
Axle/Gears: 9 bolt
Normal or bad ECM
I have a 89 iroc with stock tpi. I have a custom piggy back chip for vats delete and to raise the idle other then that stock tune. I am using the tuner pro software to see what the engine is doing and when I am reading all the data there is like a glitch where all the numbers at the same time jump to a crazy number and then back to normal. It will do this evey 3-5 sec and I can hear a change in the way the engine is running that correlates with the numbers changing. Is this normal or is there something else going on
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