Engine becomes unstablem rpm falls and engine stops when A/C works for a while, why?

Asked by Jul 26, 2014 at 03:29 AM about the 1992 Toyota Corona

Question type: Maintenance & Repair

I have a 1992 Corona (ST171). When I trun on the A/C, after working for a while (say 20
minutes), engine becomes unstable. Its repm starts fluctuating, it gradually falls and if not
assisted through accelerator pedal, it stops. What's the problem?

2 Answers


Sounds like either dirty/faulty idle air control valve or dirty throttle plate.


Too much draw on the battery/alternator. If way old, replace.

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