[SchlockRod]

I have exactly the same problem.
The car ran more & more poorly the last month or so, until today it would hardly idle. It stank really bad of raw fuel and my mileage had dropped from 50mpg to 35.
I checked for kinks in fuel return line (negative).
I visually checked injector spray with flashlight and timing light. Either way it's hard to judge, but it looks like it is hitting the sides of the TB bore (like Haynes says it should) and mist looks pretty fine, cone-shaped. No drip with key on engine off.
I disconnected vacuum line at MAP - no change.
I adjusted timing - was about 3 deg. BTDC; made it about 7 now. Still pretty bad running.
Air cleaner OK. No change with it removed.
So I looked at TPS. Going by the Haynes manual (I know. I know. It's all I have plus this forum.). It says to adjust TPS in CCW direction with 0.012" feeler at idle stop, until resistance goes to zero between A & B (the two closest to firewall).
Before adjustment I got the following readings (ohms):
A-B @ 0.012": Infinite (Spec is zero)
A-B @ 0.035": Infinite (Spec is "Continuity")
A-D @ idle: 6.25k (Spec is 4.37k-8.13k)
A-C @ idle: 1.18k (Spec is 0.24k-1.14k)
A-C @ WOT: 5.1k (Spec is 3.17k-6.6k)
After adjustment to 28 ohms A-B @ 0.012" (Haynes says go to zero - couldn't - maxed it in the CCW direction), I got the following:
A-B @ 0.012": 28 (Spec is zero)
A-B @ 0.035": 23 (Spec is "Continuity")
A-D @ idle: Infinite (Spec is 4.37k-8.13k)
A-C @ idle: Infinite (Spec is 0.24k-1.14k)
A-C @ WOT: Infinite (Spec is 3.17k-6.6k)
Seems to run better, but still wants to die sometimes at idle, and has a very "on or off" feel to the throttle - more noticeable when you lift your foot slightly (wants to nosedive).
Need new TPS? Where to buy? Or will I get the same result as our friend here (no improvement).
I haven't gotten to testing fuel pressure or exhaust restriction yet. Maybe I need to check those first?