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Thanks - haven't done this before. How many grounds/where to check? Off battery, PCM anywhere else? Is replacing a PCM something I can do with web/forum help if it comes to that ormust take to a dealer/shop? Thanks!

Well, I've gone to basics and to extremes this week. Went back and checked alternator (g00d), battery (good), fuses (good), and finally replaced the entire throttle body assembly (IAC, TSP, TB) due to all the threads about how bad these are and many symptons matched. Alas, no change. P1000 of...

K & N COI only, would throttle body issue send a signal to PCM not to start?

Would the throttle body electronics prevent the car from starting? In the threads, it always seems to cause rich or lean running. Would the TPS alone do that or if this could cause a fail safe etc. to prevent car starting, should I go ahead and replace it all since original OEM?

No codes and none now as tuner is saying no access. That has been the case throughout, no codes thrown. Symptons remind me of vapor lock in the old days.

Need help from anyone who has experienced or heard of these 05 GT symptoms. Have read hundreds of posts and found nothing quite like it, so don't know if combination of issues hit at same time. Original owner, 140M on it now with no major repairs - starter/alternator/battery 2 years old, proper...