C1500 bucking like bronco

[OlSmokie]

I was getting a bit of a stumble from my 305 at cold temperatures but now it has developed a HUGE stumble. It will fire right up and idle, but when I take off from a stop, it feels like it is running on 4 cylinders.
It bucks and shakes and almost stalls. It doesn't matter if it is hot or cold, it still feels like it is going to stall. I am going to get a new cap and rotor today, but I'm hoping someone else might have had the same issue and maybe suggest something else to try. Plugs look good.

 

[someotherguy]

Fuel pressure is...?

Richard

 

[OlSmokie]

Fuel pressure is...?

Richard

That I'm not sure of. I'm not even sure how to check it, but I will get a new fuel filter just in case. I dread the thought of changing it outside in this weather but if the cap and rotor don't help, I'll have to bite the bullet and get under there.

 

[Big98z71]

Fuel pressure check is easy, you can either rent an adapter or make one your self. If renting try to get the one that is just like a fuel filter works great

 

[BoxerPitMix]

Here is a step-by-step of how to test your fuel pressure. It's quick and crazy easy. You can rent these testers (more or less free, just make a deposit) at most auto parts stores.

http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/how-to-test-the-fuel-pump-1

That would be the first thing I'd check... And if you've never changed it - change the fuel filter. I've had similar symptoms on my old truck caused by a dirty fuel filter.

 

[OlSmokie]

Cap and rotor seems to have fixed it. I'll put the gas filter in when the weather is nicer and I will do a fuel pressure test too.
Thanks for the info.