SOURCE: Random RPM spikes during highway and city driving.
2001 montana rpm go up when driving then go down
SOURCE: 2002 Pontiac Grand Am Cruise Control
Try blowing trash out of the unit attached to the steering wheel.Sometimes,this'll eliminate the issue.If not,U may have to replace the unit.
SOURCE: I have a 2001 Pontiac Grand AM SE, 3.4 Liter V6
I have a 2000 Pontiac Grand AM GT with 147,000 miles. A couple years ago it was sluggish going up hills and the engine tachometer would jump. The dealer found nothing wrong with the fuel injectors. I use STP injection cleaner at every oil change (5,000 miles Mobil 1 synthentic). The heater was also not getting hot enough... It was warm at best. So, I had the dealer change the theromstat at cost of slight more than $200. For whatever reason the sluggishness and engine tachometer jumping issue going up hill disappeared and has not come back since. The dealer said that the theromstat can mess with a lot things. It's worth a shot.
SOURCE: I have a 2007 Pontiac
COULD BE MANY THINGS CAUSING ENGINE TO SURGE LIKE RESTRICTED FUEL FILTER.DIRTY FUEL INJECTORS FAULTY APP OR ACCELERATOR PEDAL POSITION SENSOR.
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