MY DAUGHTER HAD THE SAME PROBLEM. THERE IS A HOSE THAT GOES FROM THE VALVE COVER TO THE FUEL INJECTOR HOUSING. ITS ABOUT 12 INCHES LONG. THERE WAS A TINY LITTLE TEAR ON THE BOTTOM THAT I COULDNT SEE. I REPLACED IT WITH FUEL LINE TUBING THAT I BOUGHT FROM AUTOZONE. IT WORK PERFECT. I HOPE THIS IS YOUR PROBLEM. IT TOOK ABOUT 2 MINUTES TO FIX.
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Since the 91 model is obd1 there is no scan tool that can be hook up to it,but on the right kickpanel there is a two pin connector you can jump with a simple tool like a paper clip with the key on and the engine not running and this will cause the the mil to blink your code you will get a two different blinks a long one and a short one you combine both to get the code.example two long ones followed by one short is a code 21.
My '91 626 did the same thing. I tested the throttle position sensor, and it was good so that wasn't it. The other likely culprit is the Idle Speed Control valve, or Idle Air Control valve, which is a $500 part new (more than I paid for the whole car). I pulled one off a 626 at the salvage yard and got it for 3 bucks, put it on (it's an easy DIY, just 4 philips screws holding it to the intake manifold), however I can't be sure that solved the problem, since I haven't run the car much since then. It would seem the most likely cause, tho, and a cheap fix if you go used. Other possibilities: O2 sensor or Mass Air Flow sensor?