1999 Ford Ranger Lady needs assistance. Engine performanc

Doesn't sound like a fuel pump issue. You can check the fuel pressure at the fuel rail with a fuel pressure gauge to rule out a faulty fuel pump. It sounds like it may be a faulty or clogged fuel injector(s). Run some fuel injection cleaner through the system and see if it helps. If so, run another bottle through the system to get the rest of the gunk out of the injectors. You also should check the sparks at the plugs. If the spark is bright blue then you know plugs are good, if spark is not present or is dull orange, replace plugs and wires.

Post your results and I will follow up.

Hope this helps.
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So you mean thte mechanics didn't feel it idling poorly? If the poor idle is getting better than it probably was just bad fuel. It happens sometimes.

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No, that will not hurt anything.

But from the sound of it, it is still acting the same way it did when you originally posted your issue and before the mechanic looked at it?

So if the high octane fuel does not help, I suggest having a different mechanic look at it, because you said the last one stated it was driving normal? If it is idling poorly then it is certainly not driving normal so I don't understand why the mechanic did not detect an issue.

Post the results of the high octane fuel & fuel injection cleaner after you have ran it through the tank completely and I will follow up.

Hope this helps.
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Hi there,

Like previously suggested, you should check your fuel pressure to rule out (or not) a fuel delivery issue. Don't assume your fuel pump is okay because the car has low mileage.
A quick check you can do: remove the vacuum line on top of your fuel pressure regulator and look inside the line; if it's wet with gas, replace the regulator.
If you've been filling up your tank with cheap gas for a long time, your fuel system could very well be clogged. Running some cleaner may help, but it probably won't help in case of a clogged fuel filter.
Anyway, check your fuel pressure and let us know what you find out.

You said you replaced the plugs and wires, so I'm going to assume it's not the problem. However, were the plugs wet when you replaced them?
If so, a leaky fuel injector or defective coolant sensor could be the problem.

Also, hook up a scanner and check for trouble codes (either hard codes or pending ones); it may help pinpointing the problem.

I would also check for vacuum leaks. A vacuum leak will result in rough idle. A defective egr valve or pcv hose/valve will have the same effect as well.

I'm just throwing a few more ideas, because if it's not a bad gas problem you're just wasting your time pouring one fuel additive after another (although it never hurts to clean your fuel injection system :) )

Like previously suggested, you should find another mechanic to help you diagnose the problem.

Good luck