Mysterious cutting out after 30 minute warmup

[AirBuick]

My car will run fine for about 30 minutes and then suddenly as if heat affected, will not rev past 2000 rpm w/o cutting out. Put in brand new GM module and coil pack and still does it. Tomorrow will try spare ECM. Any other items affected by this warmed up problem? MAF test was ok. (Have T+, extender, 4" maf) Would TPS be affected by heat? Any other ideas? Thanks

 

[zam70]

Anything electrical can/will be effected by heat. You'll need to monitor EVERYHING and see what's changing.

 

[jetmech]

check your crank sensor. My buddies was chipped from bent ring on balancer and
ran real rough after it got hot.