when you first press on the gas the RPM's will go up then studying drop and it'll start stuttering.
I'll be driving along all find then the RPM's just drop and it'll do the stuttering problems again so then i have to pull over to the side of the road and let it sit for 1min and the turn it back on and let it warm up for another then everything will be find.
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You have a problem with the secondary air injection system ! The air pump is electrically controlled by the engine computer . Three things can go wrong with this system . The wiring , the pump or the diverter valve.I'll send two links on how to test it. How to test an electric air pump P0410 case study
You'll have to figure out if it is a fuel or ignition problem. Is the check engine light on ? Have you checked for trouble codes ? It could be a relay, the ignition module, coil, fuel pump, or a list of other things
if your exhaust is loose it causes car to run hotter, also if you are running the wrong gas in it, so check on that.HOWEVER your thermostat and water pump are the main suspects here. If you are losing antifreeze, it may be a blown head gasket which is No good, this is caused by your 2 main suspects here. Check oil and tranny fluid levels. you cant keep driving a car thats having problems, .. thats how you get bigger problems like blown head gaskets. TRUST ME. as a teen i owned 3 differnt cars, and had to chang head gasket on every one of them because of POOR MAINTENACE. check these things, and get back to me