jeepboy381
NAXJA Forum User
- Location
- Gresham, Or
So I have a fresh 4.0 in my 1987 cherokee. It runs very good when it is cold all the way up to about 150 degrees, then once the engine gets hotter than that it feels completely gutless. When it is cold if I stomp on it you can really tell but when its warm to hot you would hardley know I just punched the gas pedal. Also the hotter it gets the higher it idles, cold it is at 750 RPM but warm it might sit at 1,200 RPM. I know it is temperature related because if I turn my auxilery fan on to cool it down, it starts gaining power again. Any ideas?