When the ac is on and the engine is in drive it starts to stuggle does not shut off just vibrate heavily. in park this does not happen it is a 1995 toyota corolla from japan. i have heard that it may be a airflow problem.
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AC compressor put load on engine causing engine shake vibrate.but check make sure AC compressor mounting bolts tight and drive belt correct tension.now if AC compressor very old most time bad compressor cause more load on engine causing shaking real bad.
This is starting to sound very much like a blocked catalytic converter on the exhaust system. Try unbolting the exhaust in front of the catalytic unit and see if it will start and run normally. If it does then the unit needs replacing, if not then thats me tapped out for ideas.
oh,, we'll need some more information to be able to help, The thing is you didnt specify what vibrates for example when you start and you have vibrations while idiling, while in drive and the engine kicks back rough when changing gears more than likely its and engine mount thats bad. if its vibrating while idling its the fuel rpm ration (idling screw that needs adjusted or the MAP or air sensor if its fuel injected).. If its vibrating while the ac is turned on, check the ac step-up solenoid (the switch that increases the idling speed to match the ac's needed power.) we'll love to help or point you in the right direction but we'll need some more information. Describe whats happening for us , because we cant be there in person to actually experience it our selves. If you have a vid of the engine while vibrating etc all of that will be beneficial.
this means that your idle when the aircon is off is very low. basically there are 2 adjustments for idle: engine idle and aircon idle. just try to locate this screws in your engine. set the engine idle at 700-800rpm, while the aircon idle at 900-1000rpm.
Broken or worn out engine mounts will cause allot of engine vibration in drive at idle, reverse also, change all 4 the mounts, not just the 2 broken ones. As far as slow acceleration no mounts will not cause that, Have you reached the 100,000 mile recommended tune up? have you ever replaced the fuel filter, this is required every 30,000, let me know.