Low Rpm Misfire vibration and weird *** rattling noise

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Slantsix64

Slantsix64

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hey guys so i got 2 issues, i got a low rpm misfire vibration around 1000-1500 rpms in park you can feel it in drive it gets more noticeable, i seen that my spark plug cables were arching on the passenger side cables are pretty new, even swapped those with other ones and still has that misfire, although some cables are just touching the valves cover i dunno if thats an issue thier not touching the exhaust manifold.

Second Issue , lol some times when im driving and let go of the gas i hear a rattling noise like if my driveshaft if hitting something, it sounds nuts. then when i give it gas it goes away and comes back randomly i checked the driveshaft no marks, took the brakes a part nothing loose in there, and readjusted the axles 8 3/4s .
 
Broken flex plate or loose flex plate bolts maybe.
 
RustyRatRod said:
Broken flex plate or loose flex plate bolts maybe.
Click to expand...
hmm i hope not i just put the transmission back together with new bolts, i noticed on deceleration the rear pumpkin yoke would clunk, like every time, imm going to remove the drive shaft and inspect for yoke flange play at the pumpkin, i also have another set of gear i can swap to eliminate the gear s as a issue but damn i love those 3.91s lol
 
Slantsix64 said:
hey guys so i got 2 issues, i got a low rpm misfire vibration around 1000-1500 rpms in park you can feel it in drive it gets more noticeable, i seen that my spark plug cables were arching on the passenger side cables are pretty new, even swapped those with other ones and still has that misfire, although some cables are just touching the valves cover i dunno if thats an issue thier not touching the exhaust manifold.

Second Issue , lol some times when im driving and let go of the gas i hear a rattling noise like if my driveshaft if hitting something, it sounds nuts. then when i give it gas it goes away and comes back randomly i checked the driveshaft no marks, took the brakes a part nothing loose in there, and readjusted the axles 8 3/4s .
Click to expand...

Sometimes there is a weird vibration absorbing ring on the driveshaft that can come lose and rattle around. J.Rob
 
Slantsix64 said:
turns out that center pin in the 3.91 gear set came out and damaged the center section not completely out but thats what that rattle was it pressing up on the gears
Click to expand...
Yeah, that'll do it.
 
Also on the mis fire I think it was pulling too much timing with the v-can at part throttle around 1500-2000 rpms feels a lot better but imma drive it around to see if I’m not going crazy lol
 
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