rpm

I've had problems with it before but I've started to notice it more, that its running at too high rpm for only going 35 to 45 mph. I was going up a hill at 40 mph and it was running at about 2500 rpms. My idling rpms is about 1500. It's an automatic, and it just doesn't seems to be shifting...

I Have a 1997 Gmc Jimmy 4x4 it does have quite a bit of miles on it(130-140 cant remember off the top of my head) but its been acting odd lately, first off there are 2 check engine lights on it one is a charcoal box that needs replaced in the rear by the gas tank, second i believe is a coil pack...

I have a 95 Gmc Jimmy and i love my vehicle to death, but i recently have ben having a few issues. Recently i have replaced my fuel pump and sending unit and it ran fine for about two days. Out of the blue it started acting up, it has no power at all anymore and the rpms fluctuate between 1k and...