1993 Eagle Talon idles high then low???

You have a sencer out I had the same problem with my 90.

Why change the alternator, battery, and the throttle position sensor without testing them?

A vehicle that is idle searching, which can be quite common for the DSMs can be attributed to a few things, but is most likely caused by a vacuum/boost leak within the intake system.

For your particular year there is the common leaking at the throttle body o-ring seals at the throttle position sensor and the speedometer cable mount which attaches to the butterfly rod in the throttle body itself.

If your car has the Fast Idle Air Valve remove, that would also cause an idle search. But given the vehicle dies, there may be more attributed to the problem. Once the leaks have been fixed, follow the Chilton's Guide for adjusting your Base Idle Set Screw which is located on the throttle body. The vehicle's idle RPM should be posted on a sticker on the left-hand side of the hood.

Next up is to check for any vacuum or boost leaks. If you do not have a boost leak tester for a turbocharged engine I highly suggest in making one or purchasing one. They're quite cheap and will help you out immensely.

Use a can of throttle body cleaner instead of soapy water to check for the vacuum leaks as with vacuum it will suck in the soapy water, and that's bad, better to suck in something combustible. Spray all of the vacuum hoses, one at a time, and listen to the idle. If the car starts to stumble, you've found a leak. Mark the vacuum line or replace it immediately then move onto the next vacuum line.

Testing for boost leaks is easy as well; remove the intake from the compressor side of the turbocharger, attach the boost leak tester, pressurize the intake system using an air compressor to 5 PSi more than the boost you're running. Listen for leaks or spray with soapy water. You can use soapy water in this instance since you're pushing air through the system. Of course, you don't want the vehicle running during this. Fix any leaks that you find.

1993 Eagle Talon

check ur idle sensor! also check ur vaccuum lines. the crankshaft position sensor might need a look over, 2! if those things went bad, ur engine would stall and die, non stop.

try checking vaccume lines my bros car did that cuz one was split