88 90q hesitates on accel

[Tom Nas]

Hi all,

My 88 90q, NG engine w/213k km, has developed a nasty stumble on
acceleration. You press the accelerator, it feels like usual until you get
a violent hesitation. After that it's back to normal again. This mostly
happens at <3k RPM.

Plugs, wires, distributor etc have been verified to be in fine shape. WOT
switch and idle switch have been respectively fixed and verified OK. Does
my car have a throttle position sensor which could be FUBAR?

TIA for your suggestions!

Tom