77'911...appreciate the suggestions. Have never replaced the EFI relay. Not sure about fuel pressures but the O2 sensor appears to be original. I personally had the t-stat, fuel filter and plugs replaced when I bought it (about 18 months ago). Also did a sea foam treatment about six months ago.

I talked with the mechanic a bit more and they're confident it's an electrical issue. That claim comes from the fact that when it's not able to start they're finding no spark. They just aren't able to track it down. To me it's acting like a fuel supply issue but what do I know. It's giving me problems once again. Hesitates and misses at speed. Once it's parked it takes forever to get it started again. Then when I get it going it runs fine. Symptoms come and go.

No Toyota dealerships in our area. Trying to find a local mechanic that has experience with them.