Cutting Out, Bad miss- Help Needed Options

[PDXBob]

Frustrated by a Bad Miss. hope the 914World Experts can help me out!

On my 1975 914 (1.8) I have had a sporadic bad miss for the last 6 to 8 months. Here are some of the details.

- it’s been doing this for at least 6-8 months. Some days doesn’t miss at all. But today it was bucking so hard I didn’t know if I’d make it home. This was the worst it’s ever been!

- When it misses it feels like it’s bucking, that is, doesn’t feel like one cylinder miss but total cut out.

- it’s worse under a load, e.g. when going up a steep hill.

- In the driveway today I could rev it up and hold it while standing still with no miss. Didn’t matter if I held it at 2,000, 3,000 revs- didn’t miss.

- not sure if fuel or electric issue. Any tests I could do to determine?

- Does it in all gears.

- The Tac does NOT fluctuate when it cuts out.

- The lights and radio do NOT flicker or stop.


Any suggestions would be greatly appreciated. Thanks in Advance!
PDXBob

[Fazasport]

I am going to speculate that you may have a problem with the circuit board in you Throttle Position Sensor. I had the same symptoms with my '76 914 and that was the issue.
You can pull the wiring harness plug off of the TPS and drive the car. If it does not miss or buck that is your problem. A replacement circuit board is available to replace the one in your TPS.

[PDXBob]

I am going to speculate that you may have a problem with the circuit board in you Throttle Position Sensor. I had the same symptoms with my '76 914 and that was the issue.
You can pull the wiring harness plug off of the TPS and drive the car. If it does not miss or buck that is your problem. A replacement circuit board is available to replace the one in your TPS.

Thanks Fazaspot. This is something I hadn’t thought of. Man, my list of stuff to check is long- but appreciate the support from 914Worlders! PDXBob