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Did you check the fuse?
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1999 Trans Am M6, FRA, K&N, Skip Shift bypass, SLP Radiator, LS1 Motorsports lid, LS1 Motorsports Smooth Bellows
Flowtech Long Tube Headers, Lane's Custom True Duals: Dr Gas X-Pipe, 12" Dynomax Bullets, Hotchkis STB, Pro 5.0
Textralia OZ700 clutch, billet steel flywheel, 334.6 rwhp 345.6 rwtq, 2001 Trans Am A4, SLP LM2 - RIP

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Posted By: kingandrew On: 07-02-2008 @ 11:40:23     Reply | Top | Edit

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First of all, check all of the connectors and sensors in the intake. If one of these is out it is possible it will not throw a code and it could cause the car to do things you described. The computers on these cars are programmable. Did the previous owner say he used to modify and race the car? If so, it is possible he used a program such as LS1 Edit to program the computer to his performance needs. You could buy a programmer, or you could take it to a specialty shop to have it programmed for you. Replacing the entire PCM with a stock one will cost you an arm and a leg unless you can get one from a junk yard (mostly likely it will not work properly for your specific application). There is a place near Lubbock (not sure how far Abeline is from there) called Texas-Speed.com They should have everything you need for your Z. Hope this helps.
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99 m6 Trans Am, Dynatech stainless steel longtubes, 391rwhp, dual cut-outs, SLP CAI, LSX intake,TR224 cam

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Posted By: jjaurs On: 07-02-2008 @ 17:39:37     Reply | Top | Edit

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Thanks I'll test those sensors and I still need to test my O2 sensors which are probably shot since the engine's been running rich for so long. I still have the problem of the Data Link Connector not booting up my handheld diagnostics code reader though, if anyone knows why it would have no power supplied to it please let me know. I assume since the computer in the car can be tuned (that's something I didn't know, I thought you had to buy a programmable chip) that is not the reason the SES light isn't coming on, it must just be the wiring to the dash lights or the bulb.
[ Edited on 07/02/2008 @ 18:16:46 ]

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Posted By: jjaurs On: 07-08-2008 @ 22:07:37     Reply | Top | Edit

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I got her fixed today. Turns out my handheld diagnostics machine died and that's why it wasn't pulling information up. I borrowed my uncle's and it gave a throttle position sensor code. I replaced it and the connector and that fixed the high idle. I checked the O2 sensors all were good. I cleaned the Mass Air Flow Sensor and that fixed the misfire and it no longer runs as rich. It still backfires though (has no cats). I hope this information can help somebody. It developed a new problem through all of this though, now it turns over slowly even when the battery is fully charged, any ideas.

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Posted By: kingandrew On: 07-08-2008 @ 22:50:48     Reply | Top | Edit

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You may want to start a new post, not too many people are going to read through all this to help you with your new problem. I don't have any ideas either. Maybe bad starter?
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99 m6 Trans Am, Dynatech stainless steel longtubes, 391rwhp, dual cut-outs, SLP CAI, LSX intake,TR224 cam

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