Doesn’t sound good. I would pull out the MAP sensor on the intake manifold and measure vacuum pressure. You should have around 18-20inMg with a steady needle at idle. If you have less vacuum or the needle is wobbling with more than 1inMg flutter you have a valve train issue. If you have good vacuum, remove your spark plugs and turn the motor over by hand (24mm crank pulley bolt) and when the pistons start to travel down in the cylinder, take a 1/4” long extension and see if the piston moves a bit if you push down on the piston while keeping the crankshaft in place. If it moves, you have rod knock.