I've noticed that if I put the truck into neutral to coast to a stop (5 speed) the tach will dance from 500-1000 rpm. Is this normal on the 4.7, does it happen to others or is it a bad sign of things to come? Of all the stick cars I have owned none have done this.
Thanks.

 

what do you mean it will dance from 500-1000 rpms... as in it wont idle steady at all?

 

Yep. As soon as I pop it into neutral the revs fall to 500, than they jump to 1000, then fall again, and so on, till I put her in gear. Then she levels right out with no troubles.

 

hmm thats wierd.... is this a brand new truck? if yes i would bring it to the dealer... if no how many miles you got on it?

 

I don't know if it's normal, but mine's done the same thing since new ('03 4.7 5spd with 68K miles now). I think the IAC motor and TPS sensor have difficulty compensating for the sudden lack of throttle and it's taking a few tries, hence the 'bouncing' to sort everything out.

 

It' an '03 4.7 5speed QCSB w/ 76K. Not new but new to me. Everything else seems fine.

 

hmm... i would say make sure your up to date on maintnance...plugs, pcv valve, clean sensors....

 

I agree. I've got an '04 4.7 5spd. and haven't had a problem with that at all. the only thing that happens is a little jump when I pop it outta gear and the load is relased from the engine.