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Idle inconsistency

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RJ_IS_BATMAN

Proven Member
105
19
May 7, 2020
Ontario, California
Hey Everyone.

So I have been driving my 98 eclipse with a 420a in it for a few days now and the idle is so inconsistent. It hasn’t shut off or stalled out on me but some days it hasn’t problems and says around 900 rpm without ac 1k with the ac turned on. Other days it wants to stay at 1.5 to 2k with out without ad. And days like today I went to start it and it was surging from 500 to 1.5k. I attached a vid to show what it did today

here’s what I’ve done so far.
New ngk spark plugs
Ngk spark plug wires
Msd ignition
Oil change.
Coolant flush
New ac/ps belt
New battery

Any thoughts?
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Check for air leaks in air intake couplings, intake manifold leaks, and throttle body shaft seals leaking air. Can spray WD40 or soapy water on areas to test (engine rpm will change if leak).
 
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