power surging under boost

[ke6960]

89 lebaron gtc t2 convertible

i have a g-valve mbc and have had it set all the way down (like 6 or 7 psi) cause i just finished the car and got it on the road like 2 and a half weeks ago

so anyway the other day i decided to turn it up just a little and see what was what i got it up to 10 ish and it seemed ok.... but

going up a pretty steep hill in 3rd i got a surging at about 9 psi or so and between 3500 and 4500 rpm it started surging... kinda its not a really surging, technically its the opposite like as if i were bouncing off the rev limiter

i checked the codes and only got 12 55 so nothing....
i also have a dawes device af guage and it was blue at the time (my foot was on the floor)

needless to say i turned it back down and no more problems at 7psi under any circumstances

what could it be? i would like to at least like to be able to run the stock 13 psi....

[ke6960]

maybe my plugs are gapped wrong or worn??

ill check them tomorrow or maybe ill just change em im sure they are pretty old...

[itoktoeatfish]

where is the your boost gauge and mbc tapped into? Im thinking one or both have leaks and reading incorrectly. Sounds like your hitting the fuel cut out.