Rough idle when hot

from what you are saying with out me checking it, the mass air flow meter is bad it is located in the air induct hose{the ********* hose going to the air filter} has a plug on it and attached to the flex air intake hose with clamps now a trick I learded first is crank car let idle take a wrench and tap the air flow meter and see if it dies or runs rough if so change the air flow sensor Good Luck MIke L.

If the idle air control valve is bad, you'll have trouble with rough idle, stalling, surging etc. along with the sluggishness. The Mass Air Flow sensor is more likely the cause. Not sure where you're located but at AutoZone, you can return the part if you have to.

Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
-Throttle body (do the cleaning and idle speed learning)
-A /C signal circuit
-Fuel pump control circuit
-Fuel pump
-Intake system
-P C V valve (clogged or open) and hose

ROUGH IDLING:
-Cylinder Compression
-Ignition system (Igniters, spark plugs, wiring harness)
-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
-Fuel injector circuit
-E C M power source circuit
-Fuel pump control circuit
-Fuel pump (required pressure 44 psi - 49 psi)
-Throttle body (cleaning)
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Heated oxygen s ens or
-Mass air flow meter
-Idle hunting
-Throttle body
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Mass air flow meter

HESITATION/ POOR ACCELERATION:
-Fuel pump control circuit
-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
-Valve timing
-Cylinder Compression

Multiple misfires usually are caused by a bad crank sensor, some times it can be a bad cam sensor but that usually does not go bad.

If it idles up and down real high, its the throttle body sensor. If it's a low up and down idle and runs rough it is mass air flow meter. If you unplug the mass airflow meter and it will just low idle (no up & down) then the mass air flow meter is bad.

Have you had your mass air meter checked or replaced? This is the unit attached to the air intake hose behind your air filter. It senses the air temperature, speed, density, etc... and adjusts the fuel/air ratio to keep the vehicle running at "peak" performance. Also, check your TPS (throttle positioning sensor) it can also cause the problem you speak of. The TPS adjusts your engine speed/idle etc. and also compensates for hot/cold changes etc. This is roughly a $35.00 part and in most cases usually an easy fix.

try puting heat resistant shield between inlet manifold and exhoust manifold could be evaporating when hot

On the 325 series I have worked on (your year, make, model), I have found that idling issues like you describe are the result of a defective oxygen sensor. Replace the oxygen sensor with a Bosch unit. That should take care of your issue.

replace the temp sensor in the thermostat housing behind alt(2 wires)

try disconnecting the air mass meter sensor if it runs better then ur air mass meter has failed had the same problem