I have a 04 Disco II, getting the codes 171 and 174. It idles ok, and up to like 30 MPH, once I get above 30 MPH and 1500 RPM there seems to be a (for lack of better term) a shake, but if I back off the accelerator, the shake goes away. Any ideas of where/how to troubleshoot? Thanks.

 

1st guess is Vacuum leaks (that's what mine was)
or
Maf issue.... Filter box good?

 

Mine went away after fixing a vacuum leak and replacing the air filter. Or, at least it hasn't come back yet.

 

Where specifically were the vacuum leaks? I'm getting PO130 and PO171 after doing the manifold gasket replacement. Noticed some rubber vacuum connectors with tie wraps on them; are some more likely than others to leak? Should I use O-Ring lube on these to create a better seal?

 

mine was injector seal.....not related to a repair. any that you were leaning/pulling on.....start with the brake servo

 

Well, that would be ALL of them, given that the whole upper and lower intake was off!

 

oh, intake manifold.
look at the brake servo anyway.

 

Mine was injector seals

 

Did smoke test with cigar, found 2 places where there were leaks, fixed them. Running better but not perfect, should I replace the MAF?

 

Have you tried to clean (MAF) it first?, did mine when I first got the truck, no code since.