Well a few weeks ago i put in a new fuel pump this solved my starting problems . however the car still doesn’t run a 100%. The RPMs at idle will occasionally go from 1000 to 2000 RPMS after letting off the gas. After idling high for a few seconds it will return to normal idle. I let the car run the other day for a while to worm up (cold here in NJ ) and it threw this code. Po300 random/multi cylinder misfire. the opti was replaced by the dealer about 10-15k ago and plugs and wires were also changed around this time. A few weeks ago i also got a MAF code. What needs to be replaced now???

thanks,
Erick

 

Anyone???