1994 Cadillac Concours stalling

Is the check engine light coming on at all?

the check engine light comes on only at highway speeds. usually when i let off the gas or push the pedal down. the pedal also goes down without me pushing it sometimes which is probably the throttle position sensor

The "check engine" light is an indicator for a system that monitors many electronic functions in the system, also called the "malfunction indicator lamp" (MIL). It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and can lead to further component or engine damage and some are emissions related not as serious but still a problem and need to be repaired.

Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will give you specific information about what the computer saw and will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone or Advanced auto parts in your area, they will read them for free. Once you have these code numbers, we can be a lot more specific about what your problem may be.

You can also press off and warmer on the climate panel to enter diagnostics and display codes. Press and hold them together until all VF segments light and release, from there it will display all current and history codes in all modules.