Hello new to the forum. I just purchased a 1990 c1500 short bed 5.7l. I'm having issues that I can't figure out. Ok so when I dive my truck when it warms up it will start surging and bucking. I'll pull over and restart and will be good for a few minutes then start doing this again. I replaced fuel pump and filter. Replaced temp sensor and swapped out ICM. Any help appreciated thanks