There are a couple possibilities. First, the lockup torque converter could be stuck. It could be as simple as a faulty relay or it could be the torque converter itself. Second, it could be that the engine is not producing enough power to keep running when it's put into gear. For example, it could be idling fast because of a vacuum leak, but not really producing much power. When the transmission is engaged it could put enough power demands on the engine that it can't keep going.
check the soleinoid
A vacuum leak can do that. Check the gasket at the base of the throttle body for a vacuum leak.
carb problems, adjust the idle screw and see if that helps
Sounds like a vacum leak to me.
you need the fast idle adjusted on the engine you may have idle set where it sounds fine in idle but not high enuff when dropped in gear.
900rpm, and 600 rpms, respectively.
Auto-choke is stuck open
Anywhere from 18 to 21 inches. is normal.
The most probable cause would be the idle control on the engine. When you put a car in gear, there is a "load" put on it (the transmission is using power) and the idle speed normally drops. The idle could be dropping to the point where it becomes unstable and causes the engine to vibrate.
Check your motor mounts.
An idler gear is a gear between the drive and driven gear.
autozone will scan codes for free.to see what is wrong!!
You may need to adjust your idle speed or timing.
A vacuum leak could do that. Did it have a high idle before you changed the throttle body? Any codes?
Check your IAC it may need to be replaced/cleaned
A bad idle air control sensor or a bad throttle position sensor.
Did you follow the starter alignment instructions when you replaced the starter? Are you getting oil on the Bendix? That could cause the starter gear to engage slowly. It is possible that the replacment starter has a problem. Also, if the previous starter had the same problem it could have damaged the gear on the flex plate.
vacuum leak, bad idle control sensor
Try checking your spark plugs & wires. Can also be caused by dirty fuel filter.
It depends on the year. If you can't get the idle down, check for vacuum leaks. That seems to be a primary cause of high idle, especially for the TBI engines.
The idle for the 97 Taurus could be too low. The transmission bands could be sticking some as well, not allowing the transmission to come out of gear during idling.
Either you were low on gas, you need a transmission check, or the fuel pump may be going out.
idle should be aroung 900 iin park then when in gear should idle around 650 or 700
well. whenever you have a low idle, you use first gear to accelerate. if u have a higher idle or throttlebody, you can just start in second gear.