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Ok hey everyone I just built my ej255 in my 2010 wrx all new rods pistons valves bigger cams injectors. Cold start runs beautiful. But once it warms up I get a weird backfire but the motor doesnt skip.a beat it just keeps idling fine my af is lean I think. My tuner said vaccum leak no vaccum leaks.

Ok here's the mods I've done
BC 272 came
1050 CC injectors
New pistons new rods new crank new valves
TGV delete
Process west vertical top mount
340 AEM pump
Acl oil pump
 
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