Upon inspection, everything seemed ok. Noticed a ticking lifter noise and assured me its not a big deal and have been driving the van daily with his delivery company. He also advise me to replace the spark plug as it got a reading for cylinder 1 misfire. I was sold like a fool. On my way home, I notice the oil pressure gauge was not working (always read high) so I replaced the oil sensor, spark plugs, coils, fuel injector for cylinder 1. So the problem still isn't fixed and it intermittently shake on idle and acceleration. Also the new oil sensor reads very low pressure, almost to none. Is this the end for me? Does this call for a engine rebuild? Seems like all these problem are related to a bad engine. Am I missing anything? Is a minor repair/part still on the table? What else can be done to route the issue? Thanks in advance!