stangmaster07

I have a 85 GT stock block Motorsports intake and Holly 650 carb

the issue i have that's bugging me is under full throttle when i get over 3k rpm the car surges or does not rev smooth . I have change the wires and plugs . Swapped out the headers for 87 headers and have a H-pipe and turn downs ~

She idles good (slight miss)

I had the timing set to 12 deg and she is pulling STRONG Vacuum

Any ideas ?? Or has someone run into this issue

The best way to describe it is WOT she shudders through the RMP Range good pick up just not smooth

Thanks

mattdel

when was the last time the carb was rebuilt

mjr46

what about cap and rotor???

lxman1

Sounds like it could be running lean on the secondaries.

stangmaster07

Hey guys thanks for the reply's

Its a new Carb Holly 4150 and the cap and rotor are new MSD

I adjusted the front and rear floats 1/4 turn and it seemed to help !

I think she is running lean ! im going to turn the rear up a bit more and drive again after the rain lets off

how do u post a pick ?

lxman1

I usually put my pics on photobucket then post the image link. It will come out with a picture like this

mjr46

there are how to's in the sticky's

stangmaster07

Thanks

lxman1

Oh yeah, that too