I have a hard time starting my truck. When I finally get it started, it sputters and wants to shut off when I turn the A/C on. I have changed the spark plugs, fuel filter, and oil change.
Check your fuel pump pressure- sounds like the pump is on its last legs.
SOURCE: Vehicle will not start. Starter turns over, but
Are you getting good spark? Fuel pump? I know you changed your fuel filters, but can you hear the fuel pump come on when you turn the key just one click - (not all the way to start it)? OR
"There are quite a few things that might be causing your problem but the first thing I would do is have your electrical system checked out. Sometimes a bad alternator can stop charging your battery and cause this kind of problem. Even though the battery has enough voltage to turn things on it might not have enough to start the car. Most auto parts stores will test your electrical system for free. You can also check your battery cable connections and terminals. If they are corroded or loose it can cause this type of problem. There are other things that it could be but that is the most likely."
SOURCE: 1998 ford ranger, number 3 cylinder mis fires.
When you change the plug what color is the tip of the old one? This could be the answer to your problems. It should be a light beige or tan if everything is working properly.Just take one of the old plugs down to your local garage and get the mechanic to have a look at it. He'll be able to tell you why it keeps misfiring. Hope this helps.
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