What in the heck are you talking about duel fuel running ??? what year Fairlane because they haven't made one since 1970ish ???
SOURCE: Rough Idol, Running rich, Burning gas, Smog smell
1. change air filter. 2 check timing. 3 check all fuel lines and connections for leakage. 4. dirty or clogged injectors.
SOURCE: IDLES ROUGH LOSS OF POWER
just a guess but might be a fuel pump, try smacking the tank before you start it and see if it idles better after.
SOURCE: 88 Ford F 250 with 460 efi running too rich
check the o2 sensor, throttle body, vaccum lines, that timing and spark is correct and working on all cylinders( broken plug or wires), try the module on the distributor sometimes that can do it to but usally it runs good then gets bad as engine warms, to me is sounds like timing which also could be in the valvetrain or in the chain and gears in front... hopefully this gets you started in the right direction
SOURCE: I have a 2006 F250, 6.0 diesel (power stroke) it
This is very complex system. Best to have it checked by qualified diesel mechanic who has the proper equipment to check out all the systems, that could be related to the problem you are having. Just to start throwing parts at it can become very expensive very fast
SOURCE: rough running, loss of power, no fuel milage
seel it as soon as you can..lots of issues will follow soon
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