2008 4.0 stumbles with starting after sitting

inscarguy

Member
Hi all. I have a 08 4.0 that has a weird issue. When it starts cold its fine but after its used and then parked and restarted after an hour or two it stumbles on restart and puffs a little smoke( looked blue). Kinda reminds me of what a flooded carb would do. Changed both upstream o2 sensors, all vacuum lines including at canister, full tune up, cleaned maf, new gas cap, etc.

Also get a very small evap leak code once and awhile.

Any Thoughts?

Im leaning towards a leaky injector. My mechanic thinks it might be the valve on top of the tank not releasing pressure and keeping pressure at the injectors casing them to leak.
 
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