1500, 5.2 MISS FIRING

1996 Dodge Ram • V8 2WD Automatic • 135,000 miles

My 1996 dodge ram 1500 started missing after I replaced the air filter canister since it was broke, why would it be miss firing?
February 14, 2011.

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Feb 14, 2011.
A while back my truck did the same and I checked the injectorsalso changed spark plugs and notice tht the air filter canister wasnt sitting all the way down so I fixed it and it went away and ran good but now that I moved the replaced it its back again but now its intermitent I dont know where to look next any more and its driving me crazy I also checked for vacum leaks but none to be found

Feb 16, 2011.