I have two issues that are probably related. First, the cold idle runs at about 2K. Second, once it warms up AND has been driven a few miles, the idle runs at about 900, creeps up to about 1300, sputters and drops to 900 again. This takes about 10-15 seconds. One more issue is probably described as a "dead spot" in the accelerator when decelerating. When I let off the pedal slowly, it feels like I am completely taking my foot off the pedal quickly (almost like I'm tapping the brake at the same time).
I've triple-checked the coolant and it is fine. I even checked it on an incline. I have checked the throttle position sensor with an ohms meter and factory service manual. Everything is with specifications. I have had this problem before AND after I did my engine swap, so I figure it is emissions related, but I don't know anything about emissions. This is a California engine.
TIA