it does it some times, not always, u hit the gas and it wont go into 4rth ,only goes into 4rth at like high RPMS 6000 .

i think is the PCM,might be goin bad.


transmision is good, it was tuned up not long ago.

 

Auto or Standard? I had the same problem with my six speed... it wouldn't shift into fourth except extremely high RPM's then eventually it wouldnt shift into 4ht at all... eventually i ended up losing 3rd too... but the problem was that the 3/4 gear synchros were cracked