Hello everyone, I need a little help with a random misfire and what you guys think it might be.
Okay, I have already changed the plugs to NGK Iridium gapped at .060, new plug wires, new fuel filter, new air filter and I am pretty sure I have fixed all the vacuum leaks it had. I have a problem with the engine setting off a P0300 code which is for a random misfire. It only misfires though when it is on boost. When it is off boost it runs good. I checked the fuel pressure and it seemed good if i remember correctly it was around 55PSI. I put some injector cleaner thinking it was a clogged injector but that still didn't help at all.
Also I'm thinking that maybe the P0171 would set off the random misfire? I hear a ticking noise in the engine bay that flutters or gets louder when you give it gas, so I am guessing the lean condition is happening from that exhaust leak.
The car is completely stock, so is it being gapped at .060 bad? That was how it came out of the box. And also, what could cause the misfire only under boost, if off boost it runs good? I fixed almost everything but now this misfire is just getting too me....
