Same problem that happens to me, I just send my car for diagsnosis and repair and they found out that spark plugs needs to be change and the cables, cost me CAD $325.00.
first thing to check is the gearbox oil remember you have to check the oil with the engine running
95 lin town car when turning on air conditioner and the clutch kicks on in the air compressor it jerks and the jerks at the same time car experiencing loss of electricity from engine when it jerks
Since the check engine light comes on, start by having the code pulled from the computer that is causing the check engine light to come on. Most auto parts stores will do this for free and tell you what might be wrong.
Engine is in need of tuning.
If the check engine light has come on you need to read the code(s) that have been set in order to make repairs. Your local auto parts store can do this for you. If no check engine light has come on, it may be time for a complete tune up.
Could be in need of a tune up. If the "check engine" light is or has illuminated, have it scanned for codes first. The codes will help lead you to the problem.
check the trans fluid.
the reason an engine "jerks" is because all of the fuel going into the cylinders are is not completely burning thus causing a loss of power...
bollocks
Change the fuel filter.
Time for a tune up.
Have the motor mounts checked.