DowellJacob
Newbie
I have a 1994 K1500 and while traveling at highway speeds (60mph-75mph) my RPM's like to jump up and down. I've noticed the RPM's jump from around 2,200 to 3,000. I let off the gas and let them drop back to normal before getting back on the gas. Sometimes they continue to jump after that and other times not. But this only happens above 60mph, it doesn't happen after I get off the highway and onto the back roads. I replaced the EGR valve about 8 months before this started happening so I ruled that out as the problem right away. So far I've replaced the TPS and IAC valve but the problem continues. Any thoughts/advice is greatly appreciated.
