TheWarHawk

Hey guys I am new to the forums and I don't think this is the right area to post it but I can't access the general maintenance forum.

I have a 1999 ls1 Trans am auto, it is about stock excluding air filter and slp LM1 exhaust and cat delete.(I have had this issue before the exhaust install and cat delete) It was a garage kept vehicle when I bought it and I continue to keep it covered and clean.

I am suffering from a rough idle issue and a misfire I can feel at about 1500 rpms. I get the bank 1 and 2 codes and a p0300 code on my obd2. when accelerating it is very smooth and no loss of power, My car starts instantly and idles very good until it is up to optimal engine temp then I notice the rough idle. sometimes I have slight hesitation accelerating at a dead stop when it is idling terrible. I am not sure what could be the problem.

I have checked for vacuum leaks, I have replaced plugs and wires, replaced both upstream o2 sensors(the codes have returned after replacing them), I have ran a seafoam treatment and changed the oil, I have cleaned the MAF and air filter too.

Any ideas or suggestions? Thank you for reading-Travis

navyblue_02

When your car is running, wiggle each of your injector clips. If your idle improves, make note of which one, double check your connection, and get a replacement injector pigtail if necessary, Good luck!

TheWarHawk

Thank you Navy, I will try this.

RPM WS6

iTrader: (3)

What do you mean by this? Which bank 1 and 2 codes? There are several codes that are listed by bank, which ones specifically are you seeing?

RockinWs6

Check the intake bolts, I would back them all off a full turn and torque them to 89 INCH lbs.

LS6427

iTrader: (2)

And if you list a code number.......ALSO list its complete description so we don't have to go look them up.



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