I just bought a 90 camaro 350/auto car for cheap because the kid that owned it didnt know why it was missing badly. Its got 90k miles and runs.

The kid put headers on it and then took them back off and put the stock manifolds on it, he didnt attach the airtubes on one side back on the header and ran the car with no exhaust after the manifolds. He drove it about 50 miles like this, then it started missing and pops and wont rev up above 4k smoothly.

Sound like burnt valves or did it just take out the plugs?? Flames come out the manifolds when you give it gas. Other possibilities? the car still runs etc but doesnt wanna idle and dies. The car was perfect before he did this exhaust stuff

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10.91 @ 132
85' Vette - 600 horspower daily driver. 383 Stroker, TPIS Miniram, AFR 195 Stage 3 Alum Heads, 58MM BBK Throttlebody, NOS TPI Plate 175 hp Cheater kit, Full race 700R4 with 3000 Stall converter, NOS Plate 175 Shot Cheater Kit, 1.6 rockers, Corbeau Race Seats,Compucam .530/.530 Cam,
-Saleen Mustang 5.0, A4 blocked, TFS Twisted wedge heads, TFS-R Intake, Tremec TKO, 200 HP NOS Kit. 600 dynoed horsepower
-3000GT VR-4 AWD, Twinturbo, 15g turbos, HKS intercoolers, HKS EVC-IV, HKS SBOV, HKS Timer goes 12.30's

 

Quick,

It isn't going to run well without an oxygen sensor, so the lack of an exhaust is a big problem there.

If you are concerned about an exhaust valve failure, do a quick compression test.

BTW - Nice 'Y' car...

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Later,
Vader
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If you want to beat the World, it might reach up and pull you down...
Adobe Acrobat Reader

 

well all the plugs looked fouled, one sparkplug wire completely burned in half, and the header only had two bolts in it, both loose and the header wasnt even against the head.

 

sounds like a few if not all the exhaust valves are thrashed, best pull them off.

 

thought id throw in my compliment on the vette too, sweet man.