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Clean the throttle body with a spray throttle body cleaner.
Sticking valves are caused by: Carbon or sludge build-up, weak valve springs, bent pushrods on non-ohc (older)engines. If you take the car to a decent garage, he'll do a compression test to determine which cylinders are sticking, if any. Then he'll start doing expensive things. OR: You can buy a can of engine cleaner and follow the directions. I use Seafoam because I already read the directions and because it works well. It won't affect your sensors but if your engine is real dirty it may take more than one tankful of gas to get it clean. If it's that dirty the shame on you.
more than likely your throttle body butterfly valves is sticking. you can clean it with throtle body cleaner but you must remove any sensors from throttle body first.
Could be plugged fuel filter, sticking float:Change fuel filter, clean carb.
If the valves are new you grind the end of the valve stem to the proper height . Otherwise you just clean the valves up real good and put them back in , there is no other adjustment .
Change the fluids and filters. Inspect the spark plugs and wires. Clean the carburetor.
Have vehicle scanned to determine the problem
You can't adjust valves, all you can do is clean or replace them.
you take the rear turbine out of the engine and clean it and then make it dirty again and put it back in
wire wheeling the valves is the best way but scotch bright works good to.
Remove the cylinder heads from your Chevy engine. Remove the head gasket and clean the head gasket surface. Put the new head gasket on and reverse the process.
Clean the throttle body