bmd_CL

iTrader: (2)

I have a 2003 regular cab short bed 5.3 with 62xxx miles on it and for the past few weeks when its cold outside in the morning and you start it up it acts like it doesnt wanna start up and then idles all funny...revs way up and then goes down way low like its gonna die...this morning when i started it, it idled for about 30 seconds and then did die...if itll stay running for about 5 minutes it finally smooths out and runs just fine... Anyone have any idea whats going on?
Thanks

6789olds

is the CEL on ?

bmd_CL

iTrader: (2)

No...no check engine light, i have a friend that has a diagnostic scanner that im gonna try to use to check if its thrown any codes but if the cel is not on i doubt theres gonna be...any idea?

viciousknid

iTrader: (8)

If it's cold out then it could be intake gasket. Get it indoors and spray some Carb cleaner around the intake with the vehicle running and see if it sucks it in and sputters.

bmd_CL

iTrader: (2)

My check engine light came on tonight on my way home...getting it checked tomorrow....any ideas on what it may be?

viciousknid

iTrader: (8)

It'll probably be a lean code.. If it is, see post #4

bmd_CL

iTrader: (2)

If its a lean code, intake manifold gasket? Is there anyway of telling before pulling off the intake?

viciousknid

iTrader: (8)

yes......

BlackGMC

iTrader: (31)

I am betting bad o2 sensor. Drive up to autozone and have them pull the code and report back

budhayes3

iTrader: (19)

Could be a leaky fuel pressure regulator too...