Ok......for the first little while I drive my car it is fine, but then as the temperature goes up something weird happens. If I am cruising and I hit the gas hard enough to accelerate considerably.....this terrible sound comes from the hood. It's a loud high pitched scrapping sound that stops after like a second.....but then the SES light comes on. Once this happens the car is slow as s**t and the exhaust makes a horrid echoing sound, as if extra gas is burning in the muffler, but it still runs and drives. If I turn off the car and restart it....the SES light is off and the car runs fine.....unless it decides to make the noise again.

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89 Firebird Formula, white, T-tops
305 TBI
Flowmaster
Edlebrock open element
3.42 rear as of 5/22
future mods : fixing that DAMN transmission so I can stomp on it, headers, cam, etc.
"I used to be Catholic, until I reached the age of reason"-George Carlin

 

What error code comes up???

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GTA -89:Free flow muffler,dual 3" HF cats, Edelbrock headers, Vette heads, 1.52 RR 7/16, ZZ-9 cam, Big Mouth, AS&M LTB, ported plenum, 52 TB, MSD 6AL, TPIS level V prom, Mod .MAF, Superior shift-kit and some minor mods. and more to come!
http://www.itv.se/tacs/members_cars/m279/m279.html (Swedish Trans Am Club)

 

Thats another thing.....I couldnt figure out what codes the computer was throwing at me so I brought it to my mechanics house, and when he tried the same thing he said that the computer wasnt letting it get the codes out correctly and he couldnt read them properly. Please help....it is really obnoxious....