like i said, your symptoms sound like an injector missfire. they have to be replaced.

 

You can go and get your injectors pop tested, if you had an stuck injector you would proabaly notice it, my truck smoked like a freight train. If you have em out cant hurt to test em...

 

$150 bucks... And there probably going to need to be rebuilt. Which isn't worth it. Better off getting a new set something like rv275's a little more power, and better mpg.


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My truck also has a studded/misfire at idle only.It is bone stock has new lift pump,no smoke,it did throw crankshaft sensor code when check engine light came on but after I checked codes while driving check engine light went off and it has plenty of power but I'm only getting 400 to a tank of fuel.Any suggestions?

 

My truck vibrated alot right around 1800 rpm and it turned out to be the motor mounts

 

Mine is a slight miss/stutter at idle 900 RPM's could it be catiltic convertor? It does not smoke and seems to not be losing any power.The truck is stock and 16 years old.I do not know if valves have been adjusted? I did put a new lift pump on last week.

 

How long was your lift put bad for meaning how long has it not been giveing enough fuel pressure to your vp. If it has been starving your vp it could have damadged the vp but its super easy and not expensive to check the valves vp=1000$

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I would say also put a straight pipe on it ...it helps with egts mpg and ofcourse sound

 

I parked it as soon as I caught it.1 day is what I got figured.Im hoping it is not VP because my cousin has same truck as me but its a gray shortbed with 140,000 and his lift pump went out and it did get injector pump! I'm going to keep my eye on it for now but there is a local guy who I know that did a Ppump swap and has a HO VP with 20,000 miles that was feed those miles with a FASS and I can buy his VP for $700.

 

Is your truck a H.O if not you will not be able to use it ...those pumps have more pressure and less volume so it will hurt the performence of a S.O truck quite a bit and for 200-300 more you can have a the right pump from thoroughbred diesel

 

I'm glade you told me that Thoroughbred is about a hour and a half from my front door to there shop.Im hoping its not VP at all I bought the truck from a family farming friend and he is 72 years old and is very honest person.Thats the reason I bought the truck from him.I really wanted one that already had all the Hi-Performance stuff done to it but the truck is bone stock and has 202,000 miles on it now and the only things that are not original are tires,tie rods,Lift Pump and radio.The VP is original and has outlived 4 Lift Pumps(according to old owner he put on 3)and I paid cash for truck and my money is low right now or I would've put a FASS or Airdog on instead of the Air-Tex that Advance Auto made up because of lifetime Warranty.Maybe I will get lucky and not have to buy a VP! I don't have fuel in oil and the truck does not smoke so I don't think it's a injector that is causing the stutter/miss(at certain times)at idle? I do appreciate all the help I can get.There is a guy on local Craigslist that has a 5'inch exhaust for $100 Whats do you think about it? I'm thinking maybe the catalytic converter is bad its 17 years old