I finally have #'s for fuel pressure.

[siteunseen]

Just got through looping the neighborhood (cops probably soon to come) about 4 times. with the gauge on drivers windshield blade. start up 24psi, cold. patted throttle went down to 22psi. started my 1st loop medium warmth 24psi, up a hill climbed to 28psi, back down other side dropped to 24psi. middle gauge heat range (hot) 24psi, rev up drops to 20 to 22psi. hot idle 24psi @800rpm. ran terrible. unplugged TPS, ran worse, got a little smoother after 3k rpm. plugged back up TPS. unhooked vacuum line from bottom of FPR and clamped it from intake side. 34psi and ran way better until I got caught at redlight. maintained 34psi but sputtered and fluttered until excess gas burnt off then ran like a jacked leg rabbit which was very strong and quick. when running so well psi was between 32 & 34. I'm no mechanic, more a maniac but I am pretty sure it runs better with the higher psi when vacuum to FPR is clamped off. $64k question, what is the problem? thanks for any input, I'll try anything.

[ZCurves]

Do you have a spare FPR that you could try? Check for Vac leak at the FPR? I believe that an FPR is around $50 at Advance Auto Parts.

[FastWoman]

Yeah, it looks like your FPR is regulating too low. You might have other problems too, but you shouldn't be running in the lower 20's under any circumstances.

[siteunseen]

FastWoman could you please read my thread "Fuel Pressure Compatibility". I would really appreciate your opinion of that adjustable MSD 2222 regulator. If that would work on my car, and if that's my problem, it may make up for that ECU drift you spoke of. I can get one off ebay for $20 more dollars than a non adjusting BWD from Advance, they're $57.99 and the adjustable one is $79 w/free shipping.

[siteunseen]

Finally! found adjustable one that says will work on '77. went ahead and bought it.

[FastWoman]

Ah... Oops... I didn't see this until now. Sorry.

I guess you'll be able to tell us how well it works. Having a bit of adjustability will be good, because I SUSPECT you'll have to run the thing at slightly higher than stock pressure to achieve the right fuel/air mixture. I'm guessing a good starting point will be 40 psi pressure w/o engine vacuum (rather than the 36.3).