When i go to start the car it idles kind of rough. i have changed fuel pump, fuel filter, opti has about 3000 miles on it, just replaced the coil, new plugs, new wires. could it be my tps?

 

check to see if the iac valve needs cleanin. check wire connector on it too.

 

Why would the IAC valve cause it not to rev up?

 

the IAC will cause the engine to run rough at idle. The TPS could cause the engine to stumble, use an ohm meter to check to see if there are any dead spots. Did this problem just start or has it been around for a while? If it has been around since the engine mods I would look to see if you have proper fuel pressure for WOT running.

Massey

 

Have you checks for a plugged Cat?