Hello all I bought a 1500. 5.3L 151k miles has rebuilt transmission. But I am getting a rough idle that seems to come and go and sometime on highway it's shifts pretty rough. Also if I merging on to the freeway and give her juice the temp goes up fairly quick
I have done tune up new plug new wires. Cleaned throttle body. Cleaned Map sensor. Added mechanic in a bottle to fuel. Also installed new thermostat
I'm so stumped here. Thanks inadvanced.