Engine Troubles PLEASE HELP

[jasonfish320]

Hey guys, first off let me just say that you guys are awesome and I genuinely appreciate all the help and advice that I get...these forums are extremely useful and have helped me to become a better angler because of them...so enough of the *** kissing for now, let me get to my problem...Took my boat out today, like I do 3-4 times a week and something is amiss..the boat acts like it's not getting any fuel..I checked all the hoses and even replaced the fuel filter (it was over due anyhow)...the boat will start fine, but won't stay running for very long...I know that it's getting fuel because the manual hand pump to the engine is full...however, after it warms up it just quits..Things I've done so far

1) replaced all six plugs (which were all fouled)
2) replaced fuel filter and checked all lines
3) changed the fuel and mixed appropriately (16 oz./6 gals.)

#1 makes me think that perhaps the choke is stuck..(hmmm.) the choke is electronic..the type where you have to push the key in to activate

#2 the only other question is perhaps the fuel pump itself, but it doesn't make sense that it starts and runs for about 1-2mins.

After it starts the throttle is responsive for a few seconds, but quickly starts hesitating if I keep on it

The engine is an 1989 evinrude XP150 2cycle, I have taken out the oil injection and I manually mix..better safe than sorry

Thanks Again Everyone!