Clean the injectors with the Lucas product like quarterly per year, and same for the throttle body with spray (like CRC brand) they sell at auto parts stores...

 

It seems that replacing the MAF helped solved the misfire problem. My brother-in-law drove it around all weekend with no prblem. Then I decide to test drive it. I guess my brother-in-law didn't get into it too much, because once I started pushing it, it started to misfire again. This time the code was for a misfire on cylinder 6. I erased the code, and after the car sat a while, we drove it again. Drove all day Sunday with no problem. We (my son & I) noticed it would misfire fron time to time, but not to the point it would trigger a check engine light. So I drive it into work today, and what I noticed it that it pulls fine as long as throttle position is 1/2 or less. Once you go 3/4 throttle or WOT, it starts missing again. I still need to clean the throttle body. I have started using injector cleaner in the gas tank, hopefully that will help.

Any ideas?

Thanks again!

Jorden

 

Make sure 5 and 6 plugwires are not burning or shorting on the exh manifolds.
Get the codes again after clearing old ones.
PCV valve; dont loose the O-ring!
Had the same scenario after an engine swap; codes after a new MAF turned up #2 O2 sensor, that finally fixed...