Im stumped. please help!!

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Brevan

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03 ram 2500 5.7 2wd

So I was headed to do a job and truck starts running real ******, out of nowhere. Dummy light is flashing, "ok got a misfire.. I'm not quite due for plugs and wires yet" bust out the scanner and its just 0300.. no cylinder is labeled nothing i.e. 0304, 0307 etc. Checked plugs, coil packs wires everything was good. Replaced crankshaft position sensor, ran perfect for 7.5 maybe 8 miles. Then it threw an upstream o2 sensor code. Replaced both o2 sensors. Now it's running way worse than first break down. Sounds kinda like the distributor is 180°off..
Any suggestions/ ideas
Thx a mil
 

HemiLonestar

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LOL....yes, you should totally check the distributor
 
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Brevan

Brevan

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Im fully aware it doesn't have a distributor, I was using that as a comparison to how rough it's running.. thx
 

HemiLonestar

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Run a compression test and see if one of the cylinders is off. If that doesn't give you a smoking gun, pop the valve covers, see if one (or more) of your valvesprings broke on you.
 
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Brevan

Brevan

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Thx buddy! I'll check those out and fingers crossed it ain't expensive
 

Martins hemi

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Mine done the same thing
03 1500 5.7 it was the intake gasket
Also check your valve springs
Hth
 
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