You can get it all here with detailed pics of cylinders and coils
There are many causes to this problem, in a 1999 Ford Ranger 3.0L. It is usually caused by a spark plug firing when its not suppose to, or late/delayed timing.
Timing or lack of fuel
According to www.therangerstation.com , for the 2.8 L V6 engine : spark plug AWSF - 42 C spark plug gap .044 inch ignition timing 10 degrees BTDC firing order 1 - 4 - 2 - 5 - 3 - 6 distributor rotation CLOCKWISE
the timing should be set top dead center with the number one spark plug
From the front of the engine, the spark plugs are numbered 1-2-3-4. The firing order is 1-3-4-2. - Haynes Repair Manual #36071, 1993-2005 Ford Ranger Pickups.
1 - 3 - 4 - 2
because you did it wrong
The spark plug firing order is ( 1 - 3 - 4 - 2 ) and the distributor rotor turns CLOCKWISE
have u checked spark plug wires, ignition coils, timing,spark plugs or had it hooked to a reader?
The firing order should be stamped onto the engine block at some location, or on the stickers at the front of the hood.
Yes, when changing spark plugs it is a good idea to change all eight so the firing will be even.
the ranger station . com ( no spaces ) Click on Technical Library
Check for a spark at the plugs. A lack of spark could be bad spark plugs or coil or the timing system. It could also indicate an anti-theft device not resetting or an engine management problem. If the spark is good it could still be a timing fault although it is more likely to be a fuel issue.
1 - 4 - 2 - 5 - 3 - 6
There is no firing order on a diesel engine as it has no spark plugs to fire. The valve timing controls the sequence at which the cylinders ignite the fuel.
The spark plug firing order is 1 - 3 - 4 - 2 The distributor rotor turns CLOCKWISE ( for both 2.0 L and 2.3 L - 4 cylinder engines in a 1987 Ford Ranger )
Here you go, click the link.
Firing order is 1-3-4-2 Rotor turns clockwise.
Engine timing is the way that the spark is synchronized to the end of the compression stroke of the piston. Firing early will fight against the engine's normal movement and firing late will reduce power to the wheels.
The ignitor unit controls the signal from the magnito to the ignition coils. This in turn controls the spark to the spark plugs and also controls the timing of the firing of the spark plugs in proper sequence.
timing could be off. Bad spark plugs, crossed wires bad coil. Lots of things.
Look at this: http://autorepair.about.com/library/firing_orders/bl-fo-7256.htm
It is either a bad fuel injector or a problem with a valve in that cylinder
It is likely that it is not firing on all spark plugs, you should try checking spark plugs and timing, there could also be a problem with the distributor cap or spark plug leads themselves may be worn. Try chacking backwards from the spark plugs.