familiar1985

When i hit the gas in park car won't rev passed 4k. If i floor it when driving car wont pass around 4k also.

I scanned codes and got, p0300, 301, 308. Then i cleared codes. Looked at the sparkplugs on 1 & 2. and switched them along with the coil (after reading a bit i dont think this is the right thing to do). I put spark plugs and coils from 1 on 2 and from 2 on 1. Started engine got check engine light after reving it up a bit. Scanned p0300, 301, 302 (engine shaking a lot). I put the coils back to original postion but left spark plugs that were originally on 1 on 2 and on 2 on 1. Cleared codes started engine up and got codes p0300, 303, 304 after flooring car while driving. Car drove okay until you put the gas down. There was no power and check engine light came on as soon as i floored it.

Can anyone help me identify what could be causing these misfires?

Ruination Fan

Can possibly be the airmass sensor and/or plugged catalyst. You can try removing the two front o2 sensors and drive it and see if it makes a difference. It will be loud when you do drive it with the o2 sensors removed just so ya know.

paulv

Does your scan tool capture freeze frame data? If so, please check for the short term fuel trim (both banks) and the long term fuel trim (also both banks) and post the values. BTW, these values can be +/-.

Rule of thumb is when the system is working in closed loop, the STFT values will be +/-10 for each bank with approx +/-5 difference between banks. If the LTFT values are over +/-15 then an ignition problem is the most likely culprit. If the system is not in closed loop then the LTFT values are meaningless.

Regards,
paul...

familiar1985

Thanks for your input. I ended up changing the MAF and problem is resolved.