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Message: <blockquote data-quote="GDTrumbo" data-source="post: 443659" data-attributes="member: 10665">I thought previously you had maybe a weak alt and in turn a weakignition system. But if the system "pulses", it could still be... No CEL codes being thrown? I take it...no I'm good until the backfire issue. That needs to be resolved.Could be some unmetered air comming in somewhere. I'd checkgaskets at the TB/plenum/intake interfaces and any hoses involvingvacuum to these parts. Then there is the PI intake. If this is set on a pair of nPI heads(asI'm assuming here), this intake port mismatch is known to work wellin many cases. Some complain of low-end hesitations, lean conditions,vacuum leaks @ intake/head seal, etc. You've probably heard all this.I almost did the PI intake when mine cracked, but backed out. That'llhave to wait until I do the whole PI swap. Surely someone with more experience with this kind of intake combowill chime in and help. I just don't wanna send you on a wild goosechase. But, that's where I'd start.Good Luck.  GT</blockquote>