1994 gmc sierra 1500 with a 5.7 once it is warm it starts to bogg severly when accelerating it starts at about 20 km and stops once it gets to about 45...it is like the motor is going to stall but then goes again then stall and go once it finally accelerates enough it changes gear and runs fine. any ideas what could cause this

SOURCE: Same thing here...

thanks for your help I will continue checking this since I have like 2 month with this problem, I will let you know what happends probabliy I will need to take my truck to a dealer,

Regards.

SOURCE: Stalling

Possibly faulty ignition module is the problem, stalls when engine is hot when you sit for a while it cools off and runs again until it heats up again, those are usually the symptoms of a bad ignition module and after a while it may give out all together and not run at all, usually if the module is at fault it shuts down the fuel pump so the engine don't load up with fuel, do to when engine continuously cranks over the injectors never stop squirting fuel and flood the engine do to lack of spark which is produced by the module, this could possibly be your problem.

Dennis Mulford

• 1055 Answers
• Posted on Jun 06, 2009

SOURCE: 1998 GMC Sierra- runs rough then stalls when

had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!

SOURCE: 1994 GMC Sierra 1500 6.5 diesel runs for awhile then stalls

check your pmd switch. i had mine changed and it runs great. the problem is that it gets too hot and burns it up. be sure to move the pmd swith on the firewall away from the injection pump.

SOURCE: 96 gmc sierra hard to crank after 12-14 hours

that has a votec engine in it the fuel pressure is droping at knight and it takes 60 psi before the injectors will fire most likely cause fuel pump ,leaking injector ,or a feul pressure regulator