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unable to hold a steady rpm when cold.

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Old Mar 10, 2014 | 09:33 PM
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From: Wentzville Mo
Car: 89 325is, 91 z28
Engine: 2.5l 6, l98
Transmission: t56
Axle/Gears: 3:42
unable to hold a steady rpm when cold.

I recently finished my 383 super ram build, got it in and everything set up, right now just has a tune from pcmforless.

When the car is warming up you can't hold a steady rpm, the rpms will fluctuate about 1k rpm.

Once the motor is hot it no longer does this.

It has a new iac, and the tps sensor has been set within spec and didnt have any odd spikes when testing it with a voltmeter.

what would cause this? the tune? cts?
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