Originally Posted by
RobertISaar
couple of thoughts:
the PCM can command a 1-3 skipshift if the conditions are correct for it (letting off the throttle at the top of 1st can do it). oddly enough, in the log it goes from commanding 1st, 3rd, 2nd, 3rd within 4 samples....
MAP dropping at higher RPM with the throttle still being held full open is indicative of some type of air restriction. could be the TB, but could also be the air filter, tubing, etc, etc.... have to start changing out the most restrictive parts before jumping to what might not be the problem.
and if the 94-95 truck stuff is anything like the 60V6 MPFI stuff, then the TCC is probably locking based off of high RPM. may want to look around for a parameter that controls that function, if necessary.