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Weird Stumble after shut off

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Old Nov 8, 2012 | 06:58 AM
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From: LANCASTER, CA
Car: 88 IROC-Z (L98)
Engine: Edel. Lwr, SLP Rnrs, Ported Plenum
Transmission: 700R, 2800 Stall
Axle/Gears: 3:42 Posi.(4th gen.) UMI R/Susp.
Weird Stumble after shut off

Sorry guys but couldn't really find any info. because not to sure of what to look for..

Here the thing, I start the car and it idles great. Idles at about 900, let it warm up and take her for a spin.. Shut it off.. then the problem starts. Restart her and she's real ruff, (for lack of better words) stumbles/surges like crazy. Have to apply gas to start and If i let off the gas it'll shut off.. Basically have to dbl peddle to get it home but here's the kicker; after driving it for a while it seems fine again. But she'll act different sometimes. 1- she'll have a crazy/loopy idle (jumps from 900-1500) or 2- she'll be fine.. I cant seem to find the issue causing this, its got me as crazy as my idle..

Any help or suggestions please..
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