engine running rough

[oldblue64]

My 64 chevy truck is running rough right now.At first I thought it was the fuel filter,so I changed it.Still not running right.When its Idling it runs fine,but when you get in to it , it falls on its face.Like I said I checked fuel filter,and plug wiring.Need help bad,I'm about to pull my hair out.

 

[Nefarious79]

It could be any one number of things, say the coil, iginition timing, the carb ect... What do the plugs look like?

 

[oldblue64]

Hey tech Travis, Just wanted to let you know I found the problem.It all started when I bought my truck a few months ago.The truck had sat for God only knows for how many years.Well I started by removing the gas tank and cleaning it out the best I could.Within 2-hours I had it running.I ran it for a while then I went and bought a new carb,plug wires,cap.Its been running great for awhile,then it started.My gas filter started showing signs of trash.I removed it,ran good for about a day.So I removed the tank again,cleaned it with paint thinner.A guy at Auto Zone told me about this.I'll tell you,it works grat for cleaning a gas tank.While Iwas at it,I removed the carb and cleaned it.The truck runs great now.I would recommend the paint thinner for claning the tank.Thanks again for your reply.