93 j30 sputtering problem

[talbott]

ok, my 93 j30 has 159,000 miles on it and has been kept up very well, i went to the dealership about 1 month ago and got a timing belt, water pump, tentioner, cam seals, etc... anyway around 2 weeks ago my jim wolf ecu went bad according to the dealership, a mechanic there had an ecu and sold it to me, it was alot cheaper than a new one. anyway a few days ago i had this problem only for about 10 seconds then today after i was diving around for about 30 minutes i turned it back on and when i took off it wouldnt rev past around 2k rpm's. it would sputter and spit and start bouncing from 2800 to 2300 rpms like it was hitting rev limit, i started it back up and drove it around the block and it was fine. if anyone can help me with this id be very grateful, thanks.

[talbott]

i searched this for a long time trying to figure this out and got nothing as well.

[maxnix]

Please give us a little maintenance history regarding the fuel system and intake path and asssociated control valves.

[talbott]

im pretty well versed in general mechanics, but mainly on dsm's this j30 is new to me and ive taken it to the dealer for the most part. it has a new fuel filter and air filter, i always use premium fuel and have used the lucas fuel additive a few times, only run it out of gas once about 6 months ago, i put the synthetic lucas in with the oil(mobil 1) one month ago. i think it has to be something with the maf sensor or the ecu i just got, because it only happens when it gets up to operating temp. and its not a dead cylinder bacause it wont rev any higher at all its like its hitting rev limit or something.