Misfire.

[br3turns2hearts]

I have had my exp for over 2 years now...Since I bought it it has misfired on different cylinders. You can change the plugs and wires out and it will run perfect for about 3-5 months then go back to misfiring...any ideas????

 

[BrooklynBay]

Welcome to this forum! I've moved your thread into the stock 95-01 section. Scan the computer to see if there is a code or a vacuum leak. It might have a bad coil pack, leaking intake manifold gaskets or a broken vacuum hose.

 

[Dono]

I had this issue also. Something kept fouling 1 plug on each bank.
I replaced the heads and valve train.

Not sure I think it was #3 cyl, and #4 cyl. (Passenger side, closest to the firewall, and driver side closest to the front of the vehicle) that were the issue.

I couldn't tell if both heads were cracked in exactly the same spot or not. So far, everything is running great.

My thread of this is over in 'Need for Speed' under 'to cam or not to cam'