CHECK ENGINE LIGHT WONT GO FAST

[CAPTAIN CALIBRATOR]

HEY WHILE IDILING IN 85 DEGREE HEAT FOR 156 MIN. CHECK ENGINE LITE CAME ON. NOW MY TRUCK WON'T RUN PAST 2000 RPM LIMPED IT TO DEALER THEY ACTED LIKE THEY NEVER HEARED OF ONE DOING THAT !!!!! NO MAJOR PROBLEMS WITH MY DUALLY 03 DMAX ALLISON OTHER THAT AC SWITCH . 70,000 MILES I TOW A 8,000 LBS GOOSE NECK :rolleyes:

[Kennedy]

No codes set?

Many times limp modes will be cleared by restarting the engine. Trans temp OK during this situation?

[Jim Brzozowski]

First I ever heard of one doing that. With no other info available, I'd suspect clogged fuel filter. That usually seems the cure for the 2000 rpm blues.