Car dropped rpms around 5000 in 3rd gear. Now I've noticed it stuttering at WOT. Any thoughts as to why this might be happening? Thanks.

 

sounds strange...i've only heard of that kind of problem with maybe a vta bov. but i don't think that's the problem. Check your spark plugs just in case.

 

Brand new plugs.

 

check the gap...what type of plugs?

 

OEM after 30000 mile service, just couple weeks ago.

 

were the plugs replaced before or after the tune?

 

You need a fresh set of spark plugs after driving it so long utuned

 

check piping!
that happened to me and it was my ic piping hose that poped off!
factory tightening sucked i guess!
check the connection at the intake manifold

 

Driving couple weeks untuned on new plugs was enough?

 

Larry - you are a real pain in the *** !!!!!!!!!

Get some BR7ES NGK plugs gaped to .25 and report back what happens

 

I was wondering the same thing... I bought new plugs but wasn't sure whether to replace them before or after the tune.

 

yeah that can do the job

 

not understanding here. if the guy got new plugs with the 30,000 mile service not long ago why would he need new plugs?

 

He MAY need new plugs - just my diagnosis. The car was running perfectly both on the dyno and on the road after the tune. Often, boost leaks develop and other mechanical issues which can effect the way a car runs.

In this case - he drove like 4 or 5 hours to tune tune with parts on the car that he was not tuned for - (cams) so the car was prob running rich which may have fouled the plugs, read MAY.

The proper diagnostic steps in his case are :

1 - Change spark plugs

2 - do a bost leak test

3 - do a compression test

 

How much boost are you running?

Check the gap on your plugs and try gapping them to .024 or .025