Can be a dirty idle air control stepper motor plunjer and air canal, but most probably the TPS is going bad (throttle position sensor)
SOURCE: 2000 grand cherokee overheating heater blowing out cold air
Generally this condition is the result of coolant loss, or failed thermostat. If coolant goes below cylinder head level, or thermostat remains closed,heat will stop working. Do not drive with this condition as excessive heat buildup in cylinder head can and will do serious damage to heads and or head gasket.
Find out where leak is and correct it. Change thermostat as it may also be damaged. Check for excessive steam from tailpipe or miss in engine, as these symptoms indicate a cylinder head problem.
SOURCE: 02 Grand Cherokee High RPM start. Cuts out when driving
Ckean throttle plate inside throttle body...They tend to get dirtier than their counterparts in carbureted engines due to lack of fuel spray that kept them clean. If no luck with that, clean idle air control valve on TB. When doing this, don't turn the plunger, just clean with carb spray and replace. do not loose "o" ring seal.
Good luck
SOURCE: 2000 Grand Cherokee Jeep RPM and Speedometer not working
Before buying a new battery ...have your electrical system checked ...usually about 35 to fifty bucks or so ...worthy it ....instead of buying some thing you don't need ....like a battery ,alternator ...good luck
If you still are having problems let me know ...Joe
SOURCE: What will cause a Clacking/Clicking noise coming
It maybe a loose heatsheild on the manifold, converter, or underbody heatsheild.
SOURCE: 2000 pontiac grand am 3.4
Hi Tom,Did you ever figure out what the problem was? My Alero with the same 3.4 motor is doing the exact same thing between 3000-4000 rpm while driving sometimes. Mine won't rev in park over 4000 either, but I think they are all like this.
Thanks,
Mitchell
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