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Check carefully for fuel leak. If it starts well and then gets worse as it warms up, check coolant temp sensor. May be it just smells like fuel because it misses so badly fuel is not being burnt and floods tailpipe. Check spark at plugs with timing light to avoid sparks where fuel may be present. Weak or irratic spark can be coil/module, crank/cam sensor. Remove plugs to see what they look like or which is not firing.
Are you certain it's getting gas, does it smell flooded? Pull one of the plugs, see if its wet after cranking. Ground plug and check for spark, if no spark, problem could be crank sensor or coil packs.
Dirty or burnt if its black and sooty your burning oil so its leaking at the intake gasket head gasket piston ring or valve cover gasket(if the plug installs through the top of valve cover) if its light brown and dry your not getting enough fuel(a lean condition) depending on vehicle it can be a variety of things dirty or clogged injectors, bad fuel pressure(regulator pump or clogged fuel filter) if the plug if wet and smells like gas its bad spark(coil,coil pack, the plate the coil packs mount to, bad cam sensor) if its wet and doesn't smell like gas you could be leaking coolant into the cylinder(ie bad head or intake gasket or cracked block) let me know more about the vehicle and more descriptive dirty plug
you pulled a spark plug to see if they are getting wet with fuel? Have you got power to the ignition coils with the ignition switch in the on position? The coils get power and are then grounded by the ECU. if power to coils, then replace coils.