That was one hell of a fantastic reply, empire. I appreciate you taking the time to go into such detail.

As for the car, it is a 2000 Sentra SE. It's the roller rocker sr20. It has the original oem fuel system with 160k on the clock.

It really almost does seem like a vacuum leak or fuel delivery/cut issue. I always thought the file pump was a works or not part, but from what you say it could just be wearing out and reaching its end of life. I've wanted to install an electronic fuel pressure gauge for Some time. If that is the case, might as well replace it with a walboro.

Is the egr a serviceable part or just replacement? A few months ago, I noticed the egr tube was hacked off and looked like someone had crimped it with a pair of plyers... And not very well. I used a mechanic who was recommended by a family member and that is the only person, other than myself, who has touched my car. It was probably 2 months (when I changed my oil the next time) that I noticed that butchery. It was doing the decelerate thing even then, but not as bad as now. It has progressively gotten worse. so I ordered a new egr tube, put it on and hoped it would solve the problem. It obviously did not. Maybe from driving it with an essentially open egr system put some crap in it and the valve is having a hard time closing.

Thanks again for the advice. I will check these other things out and see what I find.