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Engine misfire is first suspect .. Typically the result of failing ignition coil or coils.
*Hands-on* testing using appropriate diagnostic equipment is highly recommended.
This ignition coil misfire problem can be intermittent and dependent upon a particular engine load and operating conditions - - exactly as you described.
“it doesn't seem to start until engine is fully warmed up and dosent buck at normal or heavier acceleration”
‘IF’ misfire is severe enough that the check engine light is flashing while occurring - continued vehicle operation may damage catalytic converter..
Good luck!
This ignition coil misfire problem can be intermittent and dependent upon a particular engine load and operating conditions - - exactly as you described. “it doesn't seem to start until engine is fully warmed up and dosent buck at normal or heavier acceleration” ‘IF’ misfire is severe enough that the check engine light is flashing while occurring - continued vehicle operation may damage catalytic converter.. Good luck!