well i just put some 3.73s in my car. now everytime i drive for an extended period on a parkway at like 75 or so im tachin like 2300-2700. my check engine light comes on and and its a random misfire code. i was thinking that it could be one of two things...my knock module since my exhaust is loud and road noise. or i think it could be my opti...please help and any input is greatly appreciated....here are my mods...

Mods-Madz28.com tune, true duals w/ dynomax race bullets, CATS delete, A.I.R. delete, Smooth intake elbow, MSD wires and coil, K&N cold air, Spectre ram air, 3.73s, Eibach Sportline springs, Energy Supension transmission mount and Torque arm bushing.

 

Probably the opti.. sounds like it.

 

could use a couple more opinions before i go tearing into that opti, esp since thats one helluva job and costly too...

 

It could be plugs,wires,coil,icm,02's, or the opti. Take your pick.

 

i have new plugs and wires, not even 5,000 miles on them...if it was one of the first two o2 sensors wouldnt it throw that code? i had the back two programmed out.

 

check to be sure none of the plug wires are grounding on the exhaust...sounds like that is a possibility since it's happening at running temp....as another option, you can take off the icm and have it tested before you went tearing into the opti...just a maybe!

 

Yes, start by rechecking plugs and wires.

 

well i checked all the plugs and wires, ill check the icm when i go to work tonight....what else could it be, its only when the car stays at a mid range rmp for a sustained amount of time

 

sorry but, it really sounds like plugs/wires to me. Could be coil, opti also, but to me it sounds like plugs/wires. Check for arcing (turn lights out at night and look for light coming from under hood), check for wires on headers, check your plugs if this checks out.

I bet you have a burnt plug wire somewhere.

 

it only does it after driving at a sustained 2400-2800 for about 30-40 min...DOES NOT COME ON BEFORE>>>>>>>ONLY AFTER DRIVING 30-40 MIN

 

Right, we understand. Still could be plugs/wires. Mine did this a while back and it turned out to be wires.

The time before it was the opti.

 

sent pm. can help you dinose if you have a scaner.or tell you a dereckin to go. sary for spelling have deslexia . bin a teck for 25 years.