Is this true....

Quoted from a guy on Stangnet.com!!!
if you used the lower intake off the explorer motor then you didnt put the ACT SENSOR back in... cause the explorer motor doesnt have the ACT (AIR CHARGE TEMP SENSOR IN THE LOWER... they put it in the air box ... and if you put yours in the air box... the computer will not read correctly.. you will need to drill and tap the hole in the lower intake to mount that sensor... could be a huge problem for you... also you used 1.7 rockers.. I personally see that being a problem..... I for one have had numerous problems with 1.7s and not shimming the rocker for the proper adjustment... I understand everything thinks just bolt the down and torque them to 30ft lbs and be done.. but once the engine fires and builds oil psi.. the lifters pump up and now you have valves hanging open just enough to give you false compression readings... which would also give you bad vaccume readings... just do the checks and check that ACT SENSOR ...

I relocated my ACT sensor to this spot on my CAI intake setup, would this cause my motor to load up at idle? Do the 1.7 roller rockers cause issues with speed density.... I am only getting around 13-15h/gi at idle when warmed up and I am starting to think the HO cam being that I advanced it 4* from being straight up...

 

you do have to check the preload on those lifter..... How was it when you put it together? 1/2 3/4 1 full turn you never said, so I thinking you never check it.

 

I've run with the air temp sensor both in the intake and out next to the air filter, and I really can't notice a difference between the two. If there was any difference, it was pretty slight and could have even been my imagination. Since your vacuum reading at idle was around 15, I'd start by figuring out how to get more vacuum. I think that might be the biggest contributor to the surging at this point.

 

You check for vaccuum when the engine is at operating temperature right guys?

 

I'd check it whenever you notice the problem occurring.