Re: My p/u 1988 mitsubishi 2.6L runs rough after...
Have a qualified mechanic rebuild your original carburator and reinstall it with all the original vaccum hoses and controls functioning properly.
Someone smarter than you and I, designed this engine to function properly with the feedback carburator. Installing an aftermarket carb negates the entire emision control system and will not allow the engine to "Breathe" properly.
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Sounds like restricted fuel flow...new correct fuel filter? Air/Fuel mixture...while idling...turn each screw clockwise until slight stall...then back out (counter clockwise) one and a half turns to smooth idle...Hope this helps.
I Keith,I have a 85 nissan 720 4x4 king,I have over 316,000 on it,I put 208,000 on it.How many miles do you have on it,our 720's have carburators that go out and are replaced by webers unless your in California,got one on mine,runs great.Maybe one of your coils is bad.I fought my carb.till Nissan dealer said they are problemsome and they can't be rebuilt by them.
You would need to figure out if you are dealing with a fuel problem or ignition problem to proceed. Checking the fuel pressure and for spark at the plugs when it will not start is a good place to begin. Could be a relay or a long list of other things.
It sounds like you have a vacuum leak or a carburetor problem. Check all hoses and the line going to the brake booster for cracks or leaks. Make sure the carb bolts are tight at the manifold. You can check for leaks using some carb cleaner. Spray around the base of carb while the engine is running, any leak will cause the engine to sputter when the spray hits it. You may want to look into rebuilding the carb or replace it. If its the original its a Quadrajet, they are not the easiest to rebuild but not impossible. If you rebuild it yourself, make sure to get the numbers off the carb so you can get the correct rebuild kit and accelerator pump. Plus you should replace the float when you rebuild since its 30 years old. A thorough cleaning of the carb is crucial before rebuilding. The fuel mixture screws have caps on them so they wont be altered after assembly from the factory. You'll have to remove those caps to remove these screws before cleaning. You can probably find some good info. on doing this at a good parts store. I hope this helps you.
The carb may be able to be rebuilt but those old *** carbs where not very good to start with. The Weber application is a great one and will last a very long time you can also get a kit for a holley if you want to get more performance. The engine in your truck will last forever as you already know but it will start leaking oil on the front side of the engine. When this happens the tech will try to replace the pan gasket but the problem will be the front main seal. When this happens have the tech change the timing chain at same time and you will save a fortune.
I took mine in to change the plugs and they said there are four O2 sensors in the fuel mixture system and two were bad. I didn't replace them since they were a little pricey ($500 to replace both) and I have 103,000 on the car. Has very similar roughness and occasional oscillations, but no stalling. Hope this helps.