Probably dirt in the idle channels of the carb. Find the carb mixture adjustment screw, or screws. Carefully( gently) screw it in and count the number of turns required for it to seat. (probably about 2 to 2 1/2 turns). Screw it out completely and blast the hole with "CarbClean". Refit the adjustment screw and set it the same number of turns out. If you see the adjustment screw has an O ring seal around it, smear a small amount of grease on the O ring before refitting it and screw it back carefully to ensure you do not damage the O ring in the process.
LPG
SOURCE: rough idle
fuel filters rarley cause idle problems. i would look at the egr valve or possible vaccume leaks.
SOURCE: running rough, wont idle, bad gas smell
Possible injector failure. locate by disconnecting injectors one at a time. The one that makes no change is the questionable. Status of spark plugs need chkg also. pull the plugs an the one that looks washed is questionable good luck
SOURCE: 2004 F150 Heritage. Has a rough idle and wants to
TRY CHANGING YOUR COIL PACKS AND PICK UP AN IDLE CONTROL SENSOR
SOURCE: 2003 Yukon, rough idle, extreme power loss,code
My brother had a similar issue with his Ford F-150, he needed the fuel injectors replaced. Good Luck!
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