my car was running pretty gooduntill last night i change my valve cover gasket and when i went to put everything back together now i have a p300 misfire...

so i check the spark plug wires with a om meter and one of the was at like 25 and the rest were at like 50-60...so i went and just replaced the wires and still no change still shakin and still p300 misfire...

PLEASE ANYBODY WHAT COULD I HAVE DONE TO MAKE THIS P300 MISFIRE

 

Pcv valve maybe or even a vaccuum hose not connected.

 

where would i check to see it any vaccuum hoses or disconnected....it was fine untill i went and change the valce covr gaskets...which required me to take of the coils and when i went to put it all back now p300

 

Did you take the coils off separately, or did you take them off as a whole unit, pedestal and all?

 

i took them off one at a time and then just moved the module out of my way and tookoff the coil mounting bracket

 

Did you put them back on the where they were before? It's possible you mixed the coils up. While the car doesn't care what numbers are on the coil, you may have matched the correct cylinder's wire to the correct number, but the coil was in the wrong place. Did you by any chance pull hard on the covers? Meaning you may have inadvertantly knocked a vacuum hose off. I'm not sure why homeboy mentioned the PCV valve, as it's secured in the intake.

 

well thts a chance...iam takin the coils now to get them test'd and or replace ...no the covers came off really easy with a lil shimy...where are any vaccuum lines a could have knockd loose tht i can check to see...

i've look at the motor over and over and over and cant seem to find the problem...

 

Passenger side cover is near what I believe is some of the EVAP emissions stuff. Driver side is near a brake booster hose I believe. If you had no problems, thoseprobably arenot the issue.

 

i changed all three coils and it fixd the problem...(i replaced themlike 6 months ago)and now iam using the new cheap 30$ wires instead of my msd wires....

so could a badcoil itset make the ohm reader give me a bad reading on one of the wires and make me think it's bad...cause i would love to use my msd wires instead of these cheap 30$ wires

 

Did you measure resistance with the wire on the coil?