here's whats happen'n, when i start the car it revs up high and does'nt come down to correct idle till car gets warmed up, suspected iac, but cleaned and tested and seamed to be working fine. when starting to drive throttle starts to run away,reving high without downshifting and when it does downshift it slams into gear, got code542 and was going though troubleshooting for faulty fuel circuit, changed fuel pump and front o2 sensor, checked all electrical grounds. test circuit was fine. could this be a bad fuel pressure regulator? what are signs of a bad fpr. also car wants to overheat once in awhile, suspect bad cooling temp sensor,could this have a effect on wy the throttle all over the place.
