no air coming out of intake, but throttle body yes.
Uhh, yeah, thats what I meant.
Air is supposed to be going into the engine. If its coming back out, then one of the intake valves is not closing.
Either a burnt valve, more common on an exhaust, or cracked spring or some other problem.
I don't understand why it waits until it warms up to do it. Usually valve problems are constant.
You can try the power loss test to see if you can narrow it down to which cylinder.
With it idling as best it can, pull a plug wire off and see if the rpms drop.
If so, that that cylinder is producing power.
If you pull one off and nothing happens, ease it back on partially and listen for the spark to jump to the plug.
If you don't hear it, stop at that point and find out why you have no spark to that plug.
Check cap, rotor, wire, and plug.
If you have power but the cylinder is still dead, check the compression.
You could use your thumb with the coil wire grounded or the ignition off while you bump it around if you don't have a compression gauge. It should blow your thumb off the plug hole with authority.
You can compare it to one that was producing power.
Might want to use some insulated plug wire pullers just in case......
