Wayne, engine stumbles.

[HaulinBass]

When I'm at around 4K rpm, my engine will stumble, when I mash down on the hotfoot, it clears. Could this be the TPS? As I have replaced the O2 sensor and 3 fuel pumps, and the in line 10 micro can filter. I plan on replacing the VST filter, plugs (6 months old) and the primer squeeze bulb unless they wouldn't be the cause. Could the injectors be fouled? I religiously use ring free, with occasional extra doses. It's got me puzzled, it's become an annoyance. The new LU is working nicely, thank you.
Larry

[HaulinBass]

TTT. Wayne you alright?

[Mat_HT]

Hey Larry -
Yes, its possible it could be an injector. We can flow-test them and clean them.
What do the spark plugs look like? That may give us a clue as to whats going on. Give me a call on Monday if you want. You may have to just bring the boat over and have us look at it.

[HaulinBass]

Sorry about the delay, lot's of promised unfinished projects around the hacienda. Plugs look good, slight tan/brown color. I may take you up on that offer for the injectors, what's the cost on that?.
Say, know where I could find a 250 efi ecu?