david LaB

Anyone..Ideas. My 67 mustang idles great accelerates great when in park but when I put it in gear and drive it makes popping sounds and the ride shutters or the movement of the vehile hesitates with the popping.
I took the carb off again and took it to the rebuiler. They tested it and stated it is fine. When I took off the fuel line off the carb it was pressurized and air forced out of it when i took it off.
289 engine ? v8 ? stock
THINGS Iv'e done.
Profeesionall re buillt holly carb ?2 barrell
new fuel pump
new plugs
timed the vehicle
new points.
new gas tank and purged the lines
I am checking for air leaks in the gas lines nnow
Any Ideas?
Thanks
Dave L.

a_penquin

Check your point gap, advance and ignition timing. Almost sounds like the vacuum advance may be sticking, or the timing is slightly off.

david LaB

Adjusted again the timing, points and checked fuel lines for ar leaks and it's still popping in drive when I accelerate. It still idles fine and accelerates fine when in neutral.
Any ideas?

a_penquin

did you adjust the carb right, one of the needles might have worn a little, gummed up some or wiggled loose

wagontrain

Sometimes a bad coil or spark plug will do the same thing.