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1987 944S Surging at idle

Engine

Vehicle Information: Model(924/944/968): 944S; Year: 1987; Body Type: Coupe; Total Mileage: 72K;

It starts to run really rough after it gets to a certain temp,just prior to the fan kicking in. The idle fluctuates up and down, and eventually the engine will kill. I can drive it on the highway with no noticable effect, but in-town is impossible. I normally run Premium fuel, but I did accidentally put some 87 octane in the tank. It could be coincidence, but the problem began after that. It also is difficult to start after sitting for a week or so. I changed the O2 sensor, but to no avail. Could it be a problem with one of the knock sensors? Can you test them? It was leaking gas from around one of the injectors, but I fixed that and that wasn't it either. Also, the replacement plastic caps that come with the injector seals don't seem to be the right ones. The old ones were green and markedly different

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