alfa88

Hi, I hope someone can help. I have a 91 cavaliar 4 cyl with tbf that starts great runs great for about 15-20 min.when it gets to normal temp it will start running rough , black smoke comes out the tail pipe, it runs real lean and will die. It will not start again until it is cold. any ideals. Thanks

metallica21156

i would say its a o2 sensor. it gets up in temp and computer reads from the sensor telling it to run richer.

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95 jimmy. Vortec V6. 4.3 liter CPI. ,2.5" catco cat, 2.5" cat back with flowmaster muffler, 40 street series split rear, 2 12" audiobahns in custom box,K&N CPI intake system.

71 Mustang coupe- project car. stock 302 with Cobra intake, holley 650dp, afco racing radiator, headman headers, msd distributor, 2.5" from the headers. Mag 500's with black center caps, C4 tranny with shift kit, Mach 1 body lay out.