I have a 98 F-150 ORP that has just hit 100,000 miles.. lately she has been missing or surging..Say if I shift into second or third and going a little slow, she will hesitate.. Not really a dramatic hesitation but one none the less. The plugs probably have 30,000 on them, newer fuel filter, and the oil is changed every 3,000 miles. I am not really hard on her at all, but I do mostly around town driving except during bow season and fly fishing season which is going into full swing. I did clean my MAF sensor and that has taken care of the knocking" thanks for that great info". My engine light is not on, so I really would like some suggestions on this one.. I could replace alot of things to really find the problem. Thanks for any help that you can give me..

98 F-150 ORP 5 spd reg. cab
K&N intake
afraid throttle body spacer
Rancho RS 9000 shocks " love them"
Smitty Built modular brush guard
Westin Step bars
Catch all floor liners
Professional tint
Professional dual exaust stock side stainless tips
Extang cover
vent shades
Catch & Release Wild Trout license frame

 

Have you ever had the injectors cleaned?

My 97 had similar problems, and I tried a couple of bottles of injector cleaner. After the second bottle the check engine light came on. I had a plug and wire replaced and all the injectors cleaned as a result. Just my .02.

 

That idea crossed my mind as well.. So what did that run you ?? I have also heard that the 5th plug is sometimes a problem.. Hell it could be a bunch of things and I really don't want to or can afford to just start replacing things. I did put two bottles of cleaner in just the other day.. No results as of yet. The plug wires , cerpantine belt, rotor cap and the pcv valve are all original parts.. So how is your 97 doing after the cleaning of the jets ??? I was just braging about my truck a couple of weeks ago.... I am trying my best to save my bucks to buy a Harley in July.. It figures... Hey thanks for the reply..

 

Well the dealer cured all my problems that day for the tune of $750. If I'd have been thinking, I would have went somewhere else to have the work done. But the thought of driving the truck with the miss didn't tickle my fancy either. So I bit the bullet and had it done. The truck ran 100% better afterwards.

 

Well I am going to try a few other things first, and I pray to the Harley God that I don't have to have that done.. I have the money, but that has been set aside for the HOG... Ya know I shouldn't have braging on her... One time I braged about how my lab could stay in the house for two days and never make a mess. Well wouldn't ya know I come home from work and there were 12 piles about the size of paper plates.. Go figure !!! Well I will tinker with her this weekend and hope for the best.. I appreciate all the info...