my truck is cutting out!
 

I have a 1987 Gmc Jimmy 5.7 350 v8 full size automatic. everything was good until about 20 minutes into my drive when i went to take off from a red light the truck began to cut out. so i babied it and got it to go. once it gets it in second gear it runs fine. and doesnt cut out. i tried using STP fuel injecter cleaner but it didnt help. HELP PLEASE!

RE: my truck is cutting out!
 

Might need a tranny flush. If one gear is not working properly in an automatic, it makes me believe that the passages in your tranny might be crudded up and need cleaning.

RE: my truck is cutting out!
 

have you checked your fuel filter or fuel pump?

RE: my truck is cutting out!
 

It could be the fuel delivery ( pump,filter pressure regulater) or even an ignition problem check plugs, wires, etc...

RE: my truck is cutting out!
 

have you done tune-ups lately? it could be that your ride needs some tune-up. it is also good to check some tune-up parts like spark plugs, gmc spark plug wire, fuel filters, pump, etc.. to see if there's a need for replacement.. good luck! keep us posted what other things did you notice upon checking those parts.. :)