I have a 1991 300TE that seems to pull nice and strongly between 1/2 and 3/4 throttle, at full throttle it seems like it bogs down or something. If I let off of the gas a little bit the power seems to return.

I'm currently leaning towards a possible lack of fuel pressure which is causing it to starve for during quick acceleration. You can feel somewhat of a bump in the power at WOT and I believe this is because there is a switch or something to provide WOT enrichment, but it is still nowhere near the power it should have.

I have recently replaced the plugs, distributor cap, fuel filter, and it has a good OVP relay. I also tried swapping a known good EHA valve and that, if anything, made it worse.

My question is, could a lack of fuel pressure cause somewhat of a 'notchy' feeling acceleration dependent on throttle position?
I have read that a bad voltage regulator could possibly cause some issues like this, but I believe my regulator is providing a steady voltage.

Let me know what you think

Thanks for the help!!

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1995 E300 Diesel - 298k
1983 240D - ~500k
2015 Porsche Cayenne Diesel - 90k
2013 Audi allroad - 153k