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'88 ISUZU Trooper --tach irregularly jumps while the

Sent to Car Experts October 30 02:37 PM

'88 ISUZU Trooper --tach irregularly jumps while the throttle is engaged - check engine light comes on intermittently- Vacuum switching valve? WOT sensor? Iam lost

Optional Information: 1988 Isuzu trooper II 4ze1
Already Tried:
Disconnected EGR vacuum line and vacuum switching valve to smog pump, cleaned       throttle body

Customer (name blocked for privacy)
Status:  Closed   Value: $10
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