O2 Sensors? Got any CEL?
I believe the O2 Sensors are grounded out through the exhaust....Give us more info on your symptoms. Does it run worse after exactly 30 seconds from Startup when already warm or is it after a long drive?
Ok, that makes me think that its not directly heat related and is probably more related to the ECU switching from Open Loop mode to Closed Loop. First thing I would do is clean the MAF. I'd bet its most likely sensor related if it runs good during startup.
When you say it runs rough, is it a misfire? Is it a hesitation?
It could be the TFI coil, but usually those fail due to heat. It could be the EGR valve, ECT sensor, AIT sensor, etc. Run a KOER test and see what pops up.
A ex ford tech that works with me said that it could be the tfi module taking a crap. I've always heard of them killing the car when they start to go tho.
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