PO300 on 2007 JK

I changed my intake gasket and and a cracked intake manifold on my 2007 Jk and now it’s throwing PO300 code and has a slight miss at idle. Before I did this my Jeep ran fine. I changed my plugs, wires, and coil pack but still throwing the code and rough idle. Is there something else I should be looking for to fix this problem?


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Check to make sure your plug wires are seated properly and in the right places. Also make sure your MAF sensor is clean and plugged in properly. Also check vacuum lines to make sure they're all on and not cracked/broken.

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Build Thread - Adventures of Fiona - https://wayalife.com/showthread.php?t=47407

Sounds like a vacuum leak. Like baddestcross said check all your vacuum lines and make sure you torqued all the manifold bolts down


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