Tuning and BLM help

[Slowhawk]

After getting my car running again after headers and stuff I now have another problem.When I first reset the computer BLMs at idle were 120-126 and cruise were 130-134 ,locked at 128 at WOT.

now after 60 miles BLMs are 160 at idle,130-136 at cruise,same W 128 at WOT. WOT A/F is .850.

I'm 98% sure there is no Header/crossover leaks, but the vaccuum lines are old.Would the crappy Idle BLM point at a certain problem I should be looking for?

I definitly want to fix this ASAP since it's a new motor

Thanks

 

[Eric Stage I]

Usually a vacuum leak, bad pcv, or bad MAF.


Eric

 

[Slowhawk]

How can I tell if it is a bad PVC or MAF? The car itself runs/drives very good.Figured a bad MAF would affect drivability.

 

[FreeJack]

When the car is idling. Tap on the MAF. If the car stumbles, bad MAF.