Finally got my check engine light cleared and thought I was in the clear, but ended up throwing another light, so here's what I have, any help would be appreciated:

P1128, P0300, P0303, P0304

In the past week (in order to clear the check engine light) all 4 sparkplugs were changed, both 02 sensors were changed, fuel filter was changed, and MAF is relatively new (within past month). Any ideas? Coil packs? Anything would be greatly appreciated

 

Doing some reading, should I try running it w/ an unplugged MAF?

 

Also, my car is chipped and we didn't adjust the spark plugs at all when we put them in, also part of it?

 

Bump...

 

You should certainly check plug gaps. Bad gaps will cause issues. They won't make you run lean, though, and neither will coil packs.

Your codes (you can look them up here in the future http://racediagnostics.com/cms/uploa...01_06%20.pdf):

17536 P1128 Long Term Fuel Trim mult.,Bank1 System too Lean
16684 P0300 Random/Multiple Cylinder Misfire Detected
16687 P0303 Cyl.3 Misfire Detected
16688 P0304 Cyl.4 Misfire Detected

So, you are lean, and running like crap. I would work on the lean - look for a massive leak somewhere in the intake system.

 

Alright, the misfire's only came up after the last bit of working on it when we did the O2 sensors and fuel filters. The running lean code has been re-appearing regardless. When you say a massive leak in the intake system, any usual suspects I should look at?

 

Attempting to find leaks, not found anything yet. Runs rough on startup (after sitting for a while) for about 20 seconds, then is fine. Vacuum at 20hg....

 

Also ran it with the MAF unplugged - no difference there.