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It could be several different things causing this, my first guess would be to look at the EGR port going into the intake. Most times it will clog up and can cause rough idling. You must know how to clean it properly, the EGR valve will have to be pulled as well as the throttle body in order to clean it properly. Also, check for vacuum leaks. It could be other things as well but this is where I would start. Hope this helps. Thanks, Allen with Morgan's Auto Repair 912-282-1602 Waycross, Ga.
it is 100% intake gasket,if you check the coolant reservoir,and there is oil in it,if it was head gasket you had white smoke out of tail pipe and loss of power you can run run the cylinder compression test,
gm used crappy plastic intake manifold gasket, unfortunately, it is about 1000$ or so fix
You have a vacuum leak. To find a vacuum leak check hoses and if you can't find the problem get some carburetor cleaner and slowly apply it to the throttle body and intake manifold. When the engine sounds different or when the rpm lowers you have found the leak.
Without checking the head with a pressure test anything is possible. do a compression check on the cylinders and see if you have high compression on a cylinder. If the head is cracked it will let water into the cylinder and cause high pressure. This is still true with a broken intake manifold gasket as well though depending where it is broken. It is possible that what you are seeing is blow back from the radiator over flow. You don't see any leaks when your stationary but if you drive it and then stop and check it you see the fluid. This could be a result of blow back from a loose radiator cap or bad over flow hose.
Could be the intake manifold gasket leak is upsetting the manifold vacumn which in turn will have an effect on the idling adjustments. The extra drag of the Auto Trans wnen engaged may cause the engine to 'cut-out'. Fix the manifold gasket first, re-adjust the idle, then see what you find.
1 discharge system to recovery tank
2 apply vac to remove any moisture
3 leak check system and repair any leaks
4 charge system with 134A gas and recheck for leaks
5 add 134A to specs and run system to verify proper operation.
thanks for asking , sure they are right , but be sure that it didn't leak to much , and if you have any problem there is one thing to do .... just ask fixya , and i hope a wonderful day for you , thanks for using fixya