I recently replaced rod bearings and crank in my 350 vortec and i got the engine back in and it runs like a champ but at low rpms goin down the road between 45 and 60 every once in a while there is a shudder when my foot is very lightly in the gas pedal

 

hmm..not sure...does it feel like a torque converter shudder?

 

im not quite sure it does fine in higher rpm range it happensgoing down the highway at cruising speed about1500 rpms butcity driving it is perfect no troubles

 

its not a miss?..its a rapid shutter?

 

im not certain i hooked it up th the diagnostics and it said my cam sensor on the back of the distributor was bad could that be the problem? when i got it all put back together i had a little trouble getting the distributor back in time and i got it to where it would run smoothe and it didnt do it until a couple days into driving it i know everythings not perfect by any stretch of the means im an 18 year old kid

 

have you checked the timing or the cam sensor?

 

I had something similar on my truck it was a high frequency shudder, same scenario. A month or so later my drive shaft hanger bearing blew. Unless your sure its something in the engine, I'd get it up on stands and check the drive shaft.