1994 Ford Explorer Truck surges

1994 FORD EXPLORER
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FRANKL
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Engine Performance problem
1994 Ford Explorer 6 cyl Four Wheel Drive Automatic 160K miles

While driving, my truck tends to surge. I've checked/changed the O2 sensors, EGR valve, TPS and DFPE sensor. I've also changed spark plugs and wires, replaced vacuum lines and cleaned the MAF along with the throttle body, but still have the same problem. I'm at my wits end and need help.
Nov 26, 2008 at 8:01 PM
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BMRFIXIT
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check the intake manifold gasket for leak
also check for codes
check fuel pressure and fuel pump
good luck
Nov 26, 2008 at 9:21 PM