Need help! Engine hesitating

[budbudford]

ok...

When I got home this evening I checked the vacuum pressure at the fuel pressure regulator, and there is plenty of suction there. I listened closely for any hissing on both ends of the tube and nothing. So far so good.

Now this is the frustrating part...

I decided to take it out for a 20 mile drive and check the hesitation under different load, rpm conditions. The car ran perfectly for 10 minutes then the hesitation came back. Not nearly as bad as it was before the FPR, but still there. It occured around 1500 - 2000 rpms in 2nd - 4th gear.

When I got back home I checked the vacuum again, and it was still fine. This time I checked the egr vacuum and the 2 others from that "tree" that you can pull apart. There is no air and or suction from that area or the egr valve. I am beginning to wonder if this is it.

Any ideas??

Thanks,
Ed