Misfiring issue

.............worst in 3rd gear=low fuel pressure.............kim...................

Checked yesterday with a good quality gauge with a bleed off valve so I could see if it dropped when it started flowing. Gauge read 8 Psi, and the bleed off shot a 20 foot stream of fuel out when I cracked it.

Would being way under jetted do the same thing? I am guessing fuel demand is highest under the most load, which I would think is in high gear. Thanks.