MPI Apex mid range miss

[mmaman207]

2008 apex attak with stage 1 MPI supercharger kit. Ive owned the sled since new and its been boosted since 1000 miles, and has around 7800 on it now pretty much problem free ...just awesome. It hasn't been ridden much in the last 6 or 8 years. Stored in my shop, climate controlled for most of it. I take it out a few times a year just to run it some, usually a few miles and thats it. (Just cant bring myself to sell it). It has recently developed a mid RPM miss, usually between 5500 and 6500 RPM, where it momentarily falls on it face then comes back to life. Doesnt do it above or below that RPM. My GEMs settings are the same they have always been, never changed. AFR gauge does appear to go lean when it happens... but its very quick, so hard to say for sure. I have put fresh gas in it, no change. Thinking maybe dry rotted / cracked sensing line back to GEMS??? Just curious if anyone else has seen something similar to point me in the right direction...appreciate any insight!

 

[Srxspec]

If your boost sensing line were cracked or dry rotted you would go lean big time under boost. A new set of spark plugs could be needed if they haven't been done in quite a while.