Hey there all, new to the forum. I have a 1994 Rodeo with about 150K. I recently had a leaky oil filter that was losing about a quart every 40 miles. Before I changed the oil and filter, the check engine light came on. After I changed the oil it didnt come on for a couple of days. Now it is back on, but only when the accelerator is being depressed. It turns off as soon as I release the gas or step on the brakes. Any ideas?

Sounds like a vaccum leak.