Engine/Transmission (1998.5 - 2002) RPM's jumping around?

[911RAM]

Hi , when the truck Is idleing, the needle on the rpm goes up and down, about 1-300 rpms is this normal (Its been doing It for a while)



Also, about this lift pump, looking at my sig, what should I do just keep going with the stock lift pumps, or something else I have not had to relace mine yet (74000) but I don't want to be stranded somewhere, Ive read post on the lift pump, but I did not see any facts of why one was better than the other,, please give me some info that I could make my decision thank you... .



ps I don't have a pressure gauge(I know I should get one but don't want to spend the money on one)

 

[Turbo Tim 1]

If you don't want to spend the money on a gauge then why would you want to spend the money on a new fuel system? The cheapest system would be the original! Every fuel system should be monitored whether it is stock or a FASS system. A stock system with a quality gauge is the easiest route and if the gauge tells you the lift pump is bad then you go to Cummins and buy a new one for $150. Have you ever checked your fuel pressure even with a temporary gauge? Alot of trucks have run many miles with a bad lift pump. For $300 you can have a brand new lift pump as a spare and a pressure gauge, I don't think you'll buy any aftermarket fuel system for that kind of money.

 

[Turbo Tim 1]

Forgot about your original question, mine did that two years ago during hotter weather and has never done it since. Could be the cam position sensor or a bad injector but I've never found anything definitive and my problems never came back.

 

[911RAM]

Thanks turbo tim, but you did not answer my question? so the question still remains on the second part, which is the best one to go with F. A. A. S Etc, or would I be fine Just with the wildcat stuff(sorry I don't know what It Is called) something to do with banjo's and bigger lines I really don't know what Im talking about any help would be Great!!

 

[911RAM]

forgot to ask If I was to get a fuel gauge which one and who from thanks