Re: Escape 2001
If the engine jolted forward substantially, it could be a motor AND transmission mount, depending on the miles. If the vehicle has lower miles and the engine is jerking around when you place the transmission in gear, I'd stay away. The high idle is most likely due to a dirty TB, or some sensors, such as IAC (idle air control valve), and possibly the TPS (throttle position sensor), both of which can affect idle. If the idle stays around 900rpms after you've driven the vehicle for a while then I wouldn't worry too much about that. My Taurus 3.0L V6 idles around 650-750rpm, but the bottom 500rpm on my tach is shortened, so hard to get an accurate number.
If you haven't already, be sure to ask for previous maintenance records, as this will be a good indication that the owner has taken care of the vehicle. If all the records he/she gives you are for oil changes, ask about other items such as transmission service, coolant changes, brake fluid flush and tune ups. Alas, make sure ALL fluids are clear and in good condition.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!