1990 Toyota Pickup missfires

1990 TOYOTA PICKUP
223,000 MILES • 4 CYL • 2WD • MANUAL
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DYNAMICDEREK
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  • 2 POSTS
when clutch is depressed
22 RE Engine Missfires.Sometimes it races. Sometimes it backfires.Sometimes it quits. This started after a new timing chain and a new Mass air flow sensor was installed.
Thank you
Derek
Aug 13, 2010 at 1:07 PM
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RASMATAZ
  • CAR REPAIR CONTRIBUTOR
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

Defective spark plug.
Inadequate spark/coil,defective spark plug wire.
Lack of compression
False air leakage.
Faulty fuel injectors.
Insufficient fuel pressure.
Contaminated fuel.
EGR valve that is leaking.
Oxygen sensors.
Throttle Position sensor
Idle air control valve
Aug 14, 2010 at 5:47 AM
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