Mine has 84,000. The same thing happened to mine.
Two things you can do:
1) Unhook your car battery for half an hour and see if that fixes it.
2) Change your oil.
Strangely enough changing my oil fixed the problem.
The most common problem on older model Isuzus is a leak in the pressurized
fuel system - environmental system. Check to assure the fuel cap is on
tight; look for leaks in the fuel cap and buy a new one ($10) if necessary.
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