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Erratic Idle

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Old Jan 15, 2016 | 08:04 AM
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SteveP's Avatar
SteveP
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V8 Miata Noob
 
Joined: Mar 2015
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From: Maryland, USA
Default Erratic Idle
I have a basically stock 5.0 engine (mild cam upgrade) in a 92 Mazda Miata. The car starts well and idles a little rough at 700 rpm. Driveability is good, but when the car warms up, the rpm hangs between 2000 and 2500. Installed a new IAC, no help. Car is a 5 speed with A9P EEC. Any suggestions would be greatly appreciated.
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Old Jan 15, 2016 | 07:10 PM
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Gunpilot
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From: Houston, Tx
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Adjust or replace TPS?
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Old Jan 18, 2016 | 11:20 AM
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charchri4
Jim Stainer
 
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I'd bet a vacuum leak in one of the systems that is temperature sensitive like the canister purge or EGR.
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