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I took your advice and ran the jumper wire to ground from the #30 pin on the ECM. Was able to dump the codes. Here is what I received. KOEO code 11 ok, code 10 cyl # 1 low, code 34 EVP sensor voltage above closed limit( what is the EVP, I can't find it in any of my books and where is it?)...

Took your advice and ran the pin 30 wire to ground to dump the codes. Here is what I got. KOEO, code 11 ok, code 10 cylinder #1 low, code 34 EVP sensor voltage above closed limit(what is the EVP, I can't find it in any of my books?), KOER, code 12 cannot control RPM during self test High RPM...

I have the running gear from a '90 Mustang 5.0 5 speed in a kit car. I have it up and running, but a problem. Every time I start it up it runs rough and will not idle to begin with. Slowly it will actually idle but rough, then after about 2-3 minutes as though a switch is flipped the engine...