Sounds like air filter check and /or replace .check fuel rail for proper psi
SOURCE: I need a spark plug wiring diagram for a 1990 Ford Ranger 2.3L
auto parts stores should be able to tell you your firing order
SOURCE: where is the pcv valve located on a 2003 ford ranger
SOURCE: 2003 Ford Ranger 2.3 Diagram
rough-idling engine can signal a number of positive crankcase ventilation (PCV) valve problems, such as a clogged valve or a plugged hose. But before beginning the functional checks, double check the PCV valve part number to make certain the correct valve is installed. If the correct valve is being used, continue by disconnecting the PCV valve from the valve cover, intake manifold, or hose. Start the engine and let it run at idle. If the PCV valve is not clogged, a hissing is heard as air passes through the valve. Place a finger over the end of the valve to check for vacuum.
With the engine at idle, vacuum should be felt at the PCV valve.
SOURCE: spark plug gap spec. for 1997 ford ranger/4.0 liter
for the most part it is under the hood of your car where the sticker say engine size try this website to see if they have you car listed its www.autozone.com if not call your local part store and tell them its a 4.0 liter and you need the gap on the spark plugs
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