87 showing codes 3 and 11

[pete]

My 87 2wd le with 274,000 mostly struggles to pick up speed down the road and eventually gets goin down the freeway. Sometimes She runs fine but always has horrible gas mileage.

It cuts off for split second when i give it gas (I thought Throttle Position Sensor). It does it every few seconds with the increase of gas pedal pressure. The check engine light flickers on in time with the engine stutter. no other lights show.





Showing codes 3 and 11.



#3 is ignition signal, no signal from ignitor 4 times in succession.
1) ignition circuit (+B,IGF,IGT) 2)ignitor, 3) ECU see FI-32

#11 is switch signal, Air conditioner switch on,idle switch off
1)air conditioner switch, 2)throttle position sensor circuit,3)throttle position sensor, 4)neutral start switch , 5) ECU


pulled the TPS and everything checked out ok with it.


Any Ideas on where I should try next. Anyone had something similar?




Ps.

Caution !!! when putting the sensor back on the throttle shaft because the old plastics are brittle and the metal throttle shaft pushed against the sensor plastic female housing up top where the metal ring is and I forced it down on the shaft and it snaped the ring off and broke the plastic.






Here are the old and new screws for attaching/removing and adjusting sensor on throttle body. The old style phillips strip out and then the whole throttle body has to come out to get it off then you have to grind the head out. Especially after 200,000 miles on salty roads. The upgraded hex heads I bought at lowes hardware. I think they were under a dollar. They can be loosed with a small hex key which is perfect for new TPS adjustment and later maintenance or troubleshooting without throttle body removal: