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Clean up the fuel sytem by spraying cleaner in the entire system with the engine on running at 1200 rpms. Clean the IAC (Idle air control valve) inside the fuel system. You will see 2 holes on the side of the hole inside the fuel cylinder after removing the air duct work. if not, the Idle position sensor may be bad.
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Check your throttle cable from pedal to engine,may have came loose or something has broke.Make sure floor mats isn't catching at pedal,I am a 350 fan.love to have one.Have a 85 Nissan 720 4x4 with Weber.
Either not enough or to much, check all your air pipes ensure no leaks,ensure seals are good,and no ripped pipes,
Also it could be the air mass sensor, you can remove this and clean it with carburetter cleaner try that see if it idles, they sometimes just get dirty but other times will not work. worth a try before you buy anything.
If still no joy get back to me could be something else, chjeck the air system firt though. and the idle control valve.
Are you sure that bypassing the fuel filter will solve that problem? I would not recommending doing so. If you bypass the filter then any trash coming in through the fuel will clog the injection ports. And then the car will absolutely not run. Cleaning injection ports are mighty expensive. If you suspect trash coming into the fuel, purchase a few fuel filters... about three. They are not expensive and are realitively easy to replace. If a new fuel filter helps the car run, then great! Just replace it again when the car starts stalling. Eventually, all trash from the fuel will be filtered out.
However, I do not think that a simple filter would effect the idling of the car. The idle can be adjusted, though I do not know how on your specific car. Also, you may have a faulty throttle position sensor.
Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.
Try disconnecting the battery (both terminals and let set for a few hours) with ALL the accessorries on lights-heater-radio etc. This will draw all power from your system, then recconnect battery, it's worth a try even if it doesn't solve your problem. Bill
You may have a vacuum leak. My problem was with the L-shaped rubber hose at the top of the engine near the firewall. It had collapsed and dry-rotted. Replaced it and my truck runs like a gem. I believe it was fouling out my coils on plugs. This may not work, but would not hurt to try. Good Luck!
I have a 91 shadow and had a similar problem. Mine is fuel injected, and the quick fix was to just go buy some fuel injector cleaner, I reccomend STP, and throw that in the gas tank every fill up for about a month. Mine hasn't had the problem since.
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