1999 suburban 54.000 miles won't start sometimes and stall at intersections. replaced fuel pump and still happens. After an hour or so of sitting it starts and runs fine. any answers. [email protected]

try replacing fuel filter , and next time you go to start it turn key on let it sit for count to 50 then start see what happens

What engine?

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Check the fuel injectors, with the key on one side of the two wire connector will have battery voltage, if none is present then check the ECM fuses in the underhood fuel box.

You could have a faulty fuel pressure regulator of a bad CSFI. Here is a link you may interest you to getting your Suburban running 100% again soon.

http://members.shaw.ca/betterthanyoutoo/Sticking%20Poppet.htm

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Fuel pump. It may have some pressure but not enough pressure to run the car properly. We just had to replace the pump on my son's 97 s10. It had a little pressure but not enough to run. Would start up and die as soon as you started into the throttle. They can check the pressure at a repair shop - you need a special guage.

change or adjust your choke and check the IAC, idle air control valve.

Check fuel flter at fuel pick-up intank (looks like a small wire sock). Remove fuel filter and fitting at fuel rail. Blow out fuel lines w/about 35lbs air press. Ck electrical @ relay - should be 4 connectors - one is key on hot/one is always hot/one is ground and last is hot to fuel pump. Good Luck

Check your fuel pump presure. Pump is in the tank. Also try and loosen the fuel cap, the tank vent may be stopped up.

Since you've replaced many of the usual suspects (fuel pump etc.) you might want to look into testing or simply replacing the crankshaft position sensor or the camshaft position sensor. If you intermittently lose one the these signals it would cause the problem you describe.

I had a similar ongoing problem with my 1999 GMC Suburban C1500, it occurred only in the hottest days of the Texas summer. In addition to not starting, the truck sometimes exhibited symptoms of misfiring while driving at highway speeds, as if the engine seized or as if there no fuel being delivered to fire.
I found a small garage mechanic who swore he could fix it after years of taking it to the dealer and other franchise repair shops and getting the same answer "we can't find anything it like you described, it won't do it while we're testing it, bring it in right away so we can get the history codes....blah, blah, blah". I always thought it was due to an intermittent electrical grounding issue. Anyway, long story short, the small garage mechanic was guessing a lot of the time, but after changing the fuel pump, the sending unit, fuel injection system and many return trips to the garage with me saying 'that wasn't it, it's still doing it" it finally turned out to be a faulty wiring connector link in the harness assembly ABOVE the FUEL TANK that came from the pump or sending unit. When it got hot the link would melt and create a short, when it cooled a bit it would still conduct. We replaced the wiring connector and 4 years worth of unexplainable intermittent starting problems disappeared. I spent $2K to $3K over the years, when it finally turned out to be a hidden $12 wiring connector.

Good Luck.