Hesitates like running out of gas while under load

BETTER YET!!! Replace the filter in the carb with a new one! If you are running an in-line filter AND the in garb filter, throw away the in-line filter. The in carb filter is MORE than adequate! If all the fuel filtering is new, check any soft-lines that are on the truck for deterioration and or kinks. Also check all the hard-lines for kinks. If all is good so far, drop the tank(s) and check for a strainer IN the tank on the inlet line on the sending unit.

You may have a cracked valve. Check your cylinder compression. If one's lower than the rest, you have a problem. If a valve is just slightly chipped on a edge, I've seen that exact symptom before, it would only miss under load, unfortunatly for me it was my truck that time. A compression check easily pinpointed the problem, and sure enough when the head was pulled, a chipped valve. Only after I replaced all of the parts you mentioned as well.

Ken

ngpost1 wrote:

somewhat related question...the 355 (heated right up) in my summer toy will behave as if its starving for fuel when really hot, on high speed runs. When its cold, the car goes like a bat outta hell...I can do several foot-to-the-floor-till-it-runs-outta-power runs with no problems...do it when its hot outside and the engine is hot, forget it!! it'll make power till about halfway thru 2nd gear and then stumble and fall down till you let off....feather the throttle and it comes back!!

any thoughts? the car runs too strong to have any broken parts inside, and this problem is temperature related...and very intermittent.

sounds like either fuel filter plugged, or pump is not up to par when it gets hot

if you have a scanner, watch the O2 sensor readings when it starts to stumble, they will go lean

Try replacing the spark plug wires...worked for me... gk

Looks like it was the strainer in the fuel tank. I disconnected the fuel line and blew compressed air through it (don't forget to take off the gas cap) and it seems to be running fine now.

THANKS!!!!