13hundred&20FT

Just like he said could be bad injector or fuel pressure regulator. I had one mustang that had a blown intake manifold gasket which caused the computer to think the engine was running leaner so the computer compensated by richer fuel mixture. With the extra fuel going into the cylinders it allowed some blow-by into the crank. But i dont recall the customer complaining about any smoke. Defiantly do a compression check. are there any fault codes coming up? Have you ran a scan?