89 GP Stalling Problem
Been working on a friend 89 GP, it runs pretty good, but has problems with stalling at idle, starts right back up, and the "check engine" light is not on while it's running, trying to figure out what could be causing it, i noticed when you push on brake pedal (4 wheel discs) it feels spongy, even thou the rear calipers and pads are new, fronts were still in decent shape, would a bad brake booster, or the check valve that connects to the booster not working, cause a stalling problem?
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