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Did you ever figure this out? I'm having a similar issue with my SR.
Starts on 2nd or 3rd try only and idle bounces up and down until it reaches about 62 degrees Celsius. I cleaned the IACV, replaced the coolant temp sensor, replaced the PCV valve, cleaned throttle body and MAF.
The above list had me idling ok for about 2-3 weeks but the problem came back. It seems worse now actually, it will die out if I'm not on the gas while waiting to warm up.
Next is fuel filter and fuel pressure regulator (FPR).
Any input? And yes, I know this is an old thread but it doesn't look like it was ever answered.
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