I have been trying to figure out what might be causing my truck to surge when driving @ 25-35 MPH, i have also noticed my mpg's are going down, Any body had this trouble?

 

have you swapped a yota engine into your truck?

sorry but i wanted to be the first

try something like changing the fuel and air filter. mine kind of does it while idling. the next thing is cleaning the throttle body.

 

I keep good maint on the truck I have just change the oil & the air filter, inthe morning the fuel filter will be new, I think it could be the MFAS or the EGR, what ever cost the most? It will end being.

 

I would pull the MAF and clean it.

also pull the throttle body and clean it. at only 22,000 miles my TB was dirtier than hell. and I ran premium gas.

those 2 combined can really mess up your idle and low speed running.



also, depending on your mileage, you might need new spark plugs. but I'd try the 1st 2 things first. they are easy, and pretty cheap to accomplish

 

I have around 94K miles, the plugs are inline to be changed, who knows, thanks if cleaning both the TB and MAF will by me alittle time that will be good I also have a wedding to pay for, Thanks alot.