It runs fine until it gets to operating temp, then at any time it acts like a rev limiter and falls on its face.
I bump it into neutral and rev it and it clears up and it will happen again at some point without warning.
I also tried when it fell on its face to push the accelerator pedal down harder and gets worse.
The rebuilt engine has about 22,000 miles and the fuel pump and CPU has about 224,000miles.
At the time of engine replacement I replaced the distributor, crank sensor and replaced throttle position sensor prior to engine replacement.
Had Advance Auto check the fault codes and it showed P1391, I have since then replaced the throttle position sensor and still does the same thing.


Thanks for the help.