when i drive my '84 1.9L wbx for a while, then stop at a light and idle for a
few mins, then pull out again, there is no response at first when i step on
the gas, it bogs down and then finally starts moving when the guy behind me
is almost up in my rear bumper..  any ideas?  i've been adjusting the idle
speed screw, it doesnt help.

Thanks in advance-