My main symptom is that the engine seems to be flooding while the car is driving. The quick fix that Ihave been using to get the car started again: remove the fuel pump fuse, start the car until it dies from lack of fuel, replace the fuse, and restart the car. I have been using this process for a few months now but the issue is becoming more frequent. Based on my research of the forum and internet, I'm think the best course of action is to replace the fuel pressure regulator...

The car has 225K miles on it and the full tuneup was completed recently. Since I know little about the fuel system and how it affects the engine idle, I feel like I should mention that for many years now the idle runs around 1500 rpm and coincidentally (or not? IDK) when that is the case the car does not shift to overdrive. Well, this all changed about 6 weeks ago...I was taking a rare two-hour drive and as I am going along the highway at 4000rpm I notice the tachometer start to shudder, then the car shifted to overdrive. In the moment I couldn't hardly believe it but I was very giddy and when I came to my next stop, the car was also idling normally (~900rpm). It turns out that this change is temporary--My car will only revert to normal idling and normal shifting to overdrive after driving for more than an hour. The engine has never stalled under these conditions. Maybe none of this matters, but I hope it does.

Thanks in advance for your support.