link85x

iTrader: (1)

Just recently picked up an 88' IROC-Z with a 350 TPI/T-5 combo. When i picked the vehicle up, owner told me that #8 injector was dead, so car was running on 7 cylinders. I replaced all injectors with a set of stock LS1 injectors. All injectors now currently work, but misfire was still detected. I started checking the plugs to see what cylinder was misfiring and come to find out, 3 and 5 plug wires were switched!!! Unbelievable! Anyways, I corrected the firing and the engine was finally running smooth at idle. Whenever engine is underload, it stumbles quite often. In park, it stumbles from around 1500 - 3000 rpms. What could be the possible problems causing this stumble. I replaced the coil and all plugs already. I got new injectors (semi-new, compared to the stock 92k tpi injectors). I'm thinking maybe the fuel pressure is low (bad regulator?) or the ignition module is going bad. In not sure what's going on. I'm going to check the fuel pressure tomorrow, to see if it's around 42.5 (is that the recommend pressure from factory?) Any ideas? Thanks in advance.

link85x

iTrader: (1)

Figured out the problem. Fuel pressure was at 34psi. Car's equipped with a crane adj. regulator. Thanks anyways. Later.