Motor went from running great to Running like Crap over night... Need help

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Oregon78k10

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Oct 10, 2012
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Location
Albany
First Name
Wes
Truck Year
78
Truck Model
k10
Engine Size
350 V8
So my 74 K10 with a 350 was running great when i last drove it... the next day i went out started it and took off... its extreamly slugggish and smells like gas BAD and back fires from time to time... also when i drive it slow it shifts perfectly fine, but when i give it alot of gas I swear it practically redlines befor shifting into 2nd (I dont have a tac so im just assumimng) and this all started happening at the same time. So I guessing maybe its out of time, or maybe the carb just got clogged ( I put some sea foam in the tank and so far no difference) I did replace the fuel filter as well. one of the plugs isnt getting spark? I just replaced the plugs about 4 months ago, but i checked acouple today and they do have a little bit of carbon build up on it... but not bad... anyways im not a machanic so im just guessing at all then... eveything seems to be hoocked up properly soo i dunno:
 

MrMarty51

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Oct 25, 2012
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Location
Eastern Montana
First Name
Martin
Truck Year
1978
Truck Model
K20
Engine Size
400
Moisture inside the distributor,caused from condensation can do things like that.
You said You changed plugs,How is the plug wires,distributor cap and rotor???
Not getting spark on a cylinder means a bad plug wire or distributor cap or both.
 

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