Sounds like you have gotten to know this Satty very well. The downstream O2 only monitors the cats performance.
Do you have any trouble codes?
Did you clean the throttle body and IAC port when you replaced the IAC and TPS. Sometimes a little gunk can cause problems.
Might also have a dirty EGR port and pintle. This would account for the low speed miss possibly. Easy to clean just remove and use an old toothbrush with some throttle body cleaner.
I would also check the ground for the coils and DIS module. Remove them and check the plate they mount to and the bolts for corrosion. They like to be squeaky clean.
Did you use OEM parts? I have seen a few aftermarket replacement parts bad out of the box. Plus check the connections for the sensors. Make sure they are clean and tight.
Good hunting and let us know. :)
Tuesday, April 24th, 2007 AT 11:16 AM