Interesting problem today

[1987Carrera]

I was driving my 89 Targa to work tonight; I had just put 93 Octane in her and she started acting weird about an hour later.

Her tank had 1/4 tank of 91 octane from BP and I topped her off with 93 octane from Shell.

I was driving on a road with a couple of traffic lights and she all of a sudden lost response on the accelerator. When I stopped at a red light, she idled at about 600 rpm (usually 850-900rpm) and would not respond to me depressing the accelerator. she started to lag with a response and eventually got me to the next stop light but she was very "boggy." It persisted for a couple of stop lights until she stalled out completely. I pulled to the side, put the parking brake lever up, started her, disengaged the parking brake, and she was fine for the next 30 mins.

The same issue happened on the highway, but I was able to keep the revs up and she worked it out.

Has anyone experienced this? Could it be the 93 Octane? could it be the mixture of gas?

[Danny_Ocean]

Originally Posted by 1987Carrera

Could it be the 93 Octane? could it be the mixture of gas?

No and no.

"Bad" batch of gas? Fuel filter? Dirty injectors?

[kidrock]

I've experienced something similar before, and it turned out to be a fuel pump that gradually went bad. Only happened while vehicle was warm/hot, and dying increased in frequency until it eventually stopped starting altogether.

But, I'd probably check the fuel filter first.

[john walker's workshop]

has the head temperature sensor been updated? what's the date on the DME relay? that's a standard running issue that is often cured by replacing those two items.