don't sound like a bearing unless there is a knocking noise a little one if it's a top end and a big horrible thump if it's a bottom end bearing,

it sounds like a fuel problem or spark if it isn't a lifter, comp test the 4 clylinders check there all about the same within 10% and about 120-170 psi i'd say i have been told an engine is ok to 100psi but not sure how good at that comp,

it could be a shite injector or broken down lead so have the plug's out and but take the king lead off the coil pack so you don't ark anywhere, turn it over and see if the injectors are spraying fuel, if not check each plug to see if it's them and hopefully that'll narrow your problem down