possible causes for rough acceleration from dead stop and surging at highway speeds

2002 FORD F-150
150,000 MILES
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XAVIERSERRANO70
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ford f-150 4x4 with 4.6 and automatic trans. truck has sat for 2 months. ran fine before. experiencing rough acceleration from dead stop, then smooths out. also surges at highway speeds.
Oct 16, 2011 at 10:30 PM
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ASEMASTER6371
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I would start with basics. replace the plugs and add some injector cleaner to the tank. Fresh gas may help as well.

Roy
Oct 16, 2011 at 10:32 PM
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XAVIERSERRANO70
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has fresh gas. wouldnt bad plugs make the engine run rough constantly? i will replace plugs and try the injector cleaner as you suggested. Thank you for responding so quickly.
Oct 16, 2011 at 10:41 PM
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ASEMASTER6371
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not constantly, just occasionally. I would start with basics before looking into other stuff.

Roy
Oct 16, 2011 at 10:50 PM
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XAVIERSERRANO70
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replaced spark plugs and air filter, also checked all vacuum lines. Truck still running the same. what else do you suggest. thanks
Oct 20, 2011 at 10:47 PM
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XAVIERSERRANO70
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replaced spark plugs and checked all vacuum lines. i also replaced the air filter. truck still running the same. what else do you suggest? thanks
Oct 22, 2011 at 1:05 AM