Hey guys quick question. Last week I took my 1984 Cutlass Calias in to have the tps replaced. My mechanic said he cleaned the carb really good while he was replacing the sensor, it was full of junk. My cel was on and now it's off so I think that is what was triggering my cel. Drove it to work the next day and now I am hearing a knock in the engine. I called mechanic and he didn't feel like what he did would cause a knock from engine. Checked my oil and it is full. Any suggestions or comments??? Thanks in advance. Btw 307 v8 vin y.