I don't know too much about Explorer's exactly, but I have seen this before. The usual suspect for this is usually the throttle position sensor. I think the part is only about 28 bucks and installs in about 3-5 minutes.
I would check that out before you get a full tune-up for nothing.
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What I have:
1990 Red Mustang 5.0 LX:
[BBK X-Pipe]-[MAC Cat-Back Exhaust]
[MAC Cold Air Intake]-[BBK Equal Shorties]
[3.55 Gears]-[Cobra Intake Manifold (Upper and Lower]
[E-303 Cam]-[Granetelli Mass Air Flow Sensor]
[Front and rear sway bars]-[New black carpet and seats.]
[Adjustable Fuel Regulator]-[T5 Conversion w/ K. Cobra Clutch/Hurst STS]
[Cobra Throttle Body]-[130A Alt. Conversion]
Thinking about:
Aftermarket Heads!
Vortech A-Trim
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