99 rough start

Sometimes when I start my truck, it idles really rough like it is going to cut out, and after about 5 sec., its fine. Ant help?:banghead:

Could be lots of issues, mine was the fuel pressure regulator. You can test it by pulling off the top vacuum hose off the top of it, if there is gas in there, then its bad.

The FPR is located on the fuel rail on the driver's side of the engine.

It could also be the fuel filter, when is the last time you had it changed? They should be changed every 50,000km (30,000mi).

My 98 4.3L was doing the similar thing when it was damp outside until finally it just wouldnt start on a rainy day. it ended up being the coil.