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Idle runs at around 500 rpm. when started see rest post idle problems

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Hi.. my 85 Brat when started runs at 500 RPM but runs rough.... My other Brat when I start it runs at 2000 rpm and then when I press the gas and release it drops down to 1000 rpm and idles fine and smooth... What should I do to fix the Brat running rough on start??? Also the rough one has AC.. Should when the ac is turned on boast the idel up some??? because it does not do that now??? Thanks Joe

Joe-

 

Have you tried the Seafoam treatment? I just did mine (the full Monty - intake header through the PCV, some in the oil, and some in the gas tank). Very noticeable improvement in idling and engine power.

 

If you're unfamiliar with this product, search the Old Gen forum on Seafoam and you'll find plenty of input. Get back to me if you have questions.

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