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89 F150 Inline 6 runs fine off of cold start but starts missing intermittetly when warm, just started when I moved to Florida. I didn't know if the humidity had something to do with it or what. It is a high mileage truck but has been reliable until i trailered it down here.
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General info...
Running very rich. Too much gas. Is this a carburetter with automatic choke? Inline 6 cyl.?
Sorry I'm not familier with the toyota itself.
Check that choke pull off is operating after initial start.
Remove air filter. Look at top of carb throat for a disc flap that is closed when engine is off and cold.
As soon as you start engine it should open about one third right away, then slowly open further as it warms up. It may be a small vacuum device that does the initial pull off.
If the flap does not open on start, then fully open when warm, that is the issue, causing your engine to run way too rich with gas.
check engine coolant temperature when it gets warmer, or at operating temperature, and verify that the temperature gauge is showing warmed up to operating temperature. If the coolant temperature sensor tells the computer the engine is cold it will over fuel and miss and the engine will die. When cooled down it will run fine until it warms up. Also could be coil if it starts missing after warmed up.
Sounds like one of your chambers isn't firing. Run your car for a few minutes, shut it off then pull your plugs one at a time and see if one of them is wet. Might just need a new plug.
try runing so fuel injector cleaner through it and see if that helps plus if u have not had a tune up try giving it one anbd put a new air filter in it
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