1995 Toyota Tacoma 4x4 with 2.7L. misfires on all cylinders at idle and throughout RPM range to about 3900RPM then runs fine on up to red line.codes store for check engine light are: P0301, P0302, P0303, P0304. have replaced ignition coil, rotor, cap, plug wire, spark plugs, fuel filter, pcv valve, pcv valve hose, took to shop said it could be possible fuel pump? why would it have fuel at high RPM? problem started after car washing under hood to remove mud. started vehicle and check engine light flashed. ignition coil gave it more power but could not correct misfire. found out when i unplug the MAF sensor and start the truck the problem goes away. no missing what so ever, but i guess it runs it rich? im not sure cause you can see black carbon coming out of the exhaust, so im sure its not good to run the vehicle with it unplugged as well as the gas millage is horrible with it unplugged. tried new MAF sensor and made NO difference. also doesn't miss for the first 5 secs after its started.
Mar 28, 2010 at 2:59 PM