My 93 22re runs rich and it has for a while, since I got it in February I'm not sure what happened I thought it was burning oil for a while because I'd have to put a quart in it like every month, but all of a sudden like two months ago I changed the oil and it hasn't lost any since. There is a strong fuel smell that comes from the exhaust, and it smokes white when it idles for a bit and then I give it gas (for example in the drive through line). It seems to have gotten a little better since I put that fuel treatment stuff in it a couple times over the past months. It makes a diesel/marble rattling noise when lightly accelerating and decelerating, but not when I step on it quickly or take my foot off quickly. Today I took the throttle body and intake plenum off for cleaning. Little bit of carbon build up but not that much doesn't look like it really burns oil, but there was a little bit of oil in the intake manifold. It smelled of fuel (Assuming this is due to the EGR system cycling the rich exhaust back in ?). The cold start injector has a little bit of carbon on it but doesn't really look like its enough to do anything mostly just around the edges of it. Other than that I haven't had any real problems with it it runs fine and the diesel rattle/ knock hasn't gotten any worse and I've put about 8,000 miles on it .Anyway just trying to get it to run better and I'm kinda lost, I'm 17 and this is my first vehicle.

 

Most often it's either the Cold Start Injector or the Cold Start Injector Switch. Here's a good write-up by LCE on how to test both: https://lcengineering.com/fuel-injec...r-time-switch/

You should also definitely check & clean your Idle Air Control Valve on the Throttle Body. Those can often carbon up and the plunger/piston in them can stick. Here's a decent video about it:
Oil in the intake manifold could be a stuck open PCV valve. if you don't know when it was replaced last go ahead and get a new one in there, they are cheap enough. You might also need a new rubber grommet for the valve; those can break or crack over time & cause a vacuum leak.

Part references:
PCV Valve - https://www.rockauto.com/en/catalog/...on)+valve,5052
PCV Valve Grommet - https://www.rockauto.com/en/catalog/...+grommet,11785
Most local parts stores should have these in stock, especially the the Standard Motor Products parts.

I'd also suggest that you adjust your valves, if you have no idea when they were done last. Info here: https://lcengineering.com/engine-20r...ve-adjustment/
While you have the valve cover off take a look down the front at your timing chain & check it for excess slack, and a possible broken timing chain guide on the driver's side. That driver's side guide (factory unit) is well known to break. If your timing chain, guides and tensioner are original and if your engine has over 100,000 you're probably due for a replacement timing set. The diesel/marble rattling noise could be a broken guide and/or a stretched out/worn timing chain.

 

that’s a pretty dam good explanation thanks