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I need help diagnosing an issue with an 01 Nissan Sentra 1.8L GXE. Many thanks in advance!

On a cold engine, the engine sputters and stalls once I put into gear.
On a warm engine, lack of power and hesitation under ~2k RPM. Gets worse the more I push the throttle.

No idle issues in P or N ever. No idle issues when warm in any gear. No unusual noises. No impact on MPG.

Has been like this for at least 1k miles.

No codes.
MAF and ECM replaced 7 months ago. MAF just cleaned.
New filter (Purolator)
New spark plugs (NGK Iridium)
OBD II readings seem reasonable for throttle position, Coolant temp, and air temp.

Vacuum test shows: rapid fluctuation 18-21 at idle, rapid fluctuation bet. 19-23 at 2k RPM, crazy fluctuation 13-22 at 3k, and a steady 21 at 4k. Video: http://www.youtube.com/watch?v=msCholgxizA

At first I thought was a vacuum leak or a faulty EGR diaphram, but the vacuum test makes me think I have a broken/sticky valve... Please advise.

The engine is locked

Need to adjust headlight on passanger side. It is pointing down after fixing something on front end.

my truck is a 6 cylinder automatic

Some said it may be the head gasget or a heating eliment I see no leaks and the car runs good exect for this

Any other fuses hidden or relay switches?

Before doing so the check oil light would flash on an off for a second then completely lights up and come to a stop. My check engine light is on. I have just changed the 02 sensor, ignition coil and ignition harness. Please share your expertise with me.
YC
Hagerstown,MD

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