Think I know but don't know y

[moses]

Ok for some reason I can't find NGk bkr8e spark plugs in any of these stores around here so I guess I will have to make due with these 7's. I drove around yesterday for about 70 miles and it drove beautiful. Not as much fluctuation in the a/f gauge. I got 90 more miles and I'll see if it changed when I start boosting. My car dies tho if I get off the throttle and straight on the brakes and clutch. I am pretty sure it is a vacuum leak somewhere and I can't for the life of me find it. My gauge is reading 11inhg which is even low for a sr with jwt cams and thick headgasket. I sprayed carb cleaner everywhere I could possible think of.