truck cough

[flips87c30]

My truck has recently developed a cough/stutter it only seems to happen at mid throttle it wont happen once I am up to speed, or when I give it more to get up a hill. But going from a dead stop it coughs like crazy. It also runs just fine in park I can rev it up no problems. Im thinking I should start looking at the distributor cap and rotor. I just replaced them mabey I screwed something up? Any suggestions? Thanks in advance.

[Mule man]

I'm almost sure that you have a vacuum leak.  Probably a cracked rubber line somewhere.

[flips87c30]

Been working on the truck all morning still cant figure this out. I cant find any leaking vacuum lines. It runs fine for a mile or two then starts acting up again.It was running fine, before I replaced the following, right side exhuast manifold, dist cap and rotor, map sensor, thermostat, and the preheater hose. this cough has me stumped its almost like a really quiet backfire. Could it be my pick up coil? At this point im just guessing.

[zieg85]

Could you have accidentally crack the ceramic on a spark plug or damage a spark plug wire?

[flips87c30]

yes. thanks zieg. I dont even know what to say for myself. 

[VileZambonie]

Try Robitussin 

So is it skipping or hesitating?

[zieg85]

My initial thought was "does anyone have a Ricola?"

[VileZambonie]

RRRRIIIICOLAAA!!!!

[flips87c30]

Try Robitussin 

So is it skipping or hesitating?

Obviously tried Robitussin first thing but it fouled my injectors, the vicks vapor rub on the air filter proved equally useless.  In all seriousness I guess Its skipping. But I think I found my problem when I looked closely at the plug wires. one was partially melted. time for a new set. any suggestions, What brand do you guys use?   

[Captkaos]

I run off the shelf stuff for my driver..  Accel MSD or Taylor for my non-stock stuff.

[VileZambonie]

Always run a good quality set of ignition cables don't get the cheap ones.