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New engine in, Slight idle problem

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ryanx99GS

20+ Year Contributor
247
1
Sep 26, 2005
St Louis, Missouri
Okay so I recently swapped in a 7bolt with a 1g CAS/1g NT TB/ and the cyclone intake manifold (without butterfly actuator, wasn't there when I bought it). I also did the vacuum delete. Car starts. I transfered over my 2g TPS to the 1g TB. Now when I start the car (I have the downpipe off btw because I have to rethread the holes, :notgood: rust) it will hold at idle at 1.5k RPM's and sometimes fluctuates by dropping a tad and then back up. I have the Biss screw screwed in all the way, if I start to unscrew it then the idle starts to climb RPM's. Anyone know what the problem is? Could the downpipe (exhaust leak) be causing it to idle that high?

Could the problem also be the 1g ISC? Would my 2g ISC fit on it? Another possibilty that I think may be the problem is this:

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I do not have a plug on my 99 engine harness to connect to that. Would that have anything to do with it also?
 
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