I just bought my 92 3.9l V6 magnum dodge Dakota. It had a power issue when I bought it. It seems to have a miss while driving up steep grades. I even heard a faint popping noise while really stepping on it. I have replaced wires and plugs and ran some seafoam through it. Its still missing. I have been told it could be clogged injectors or even a burnt valve. I did the dollar test by the exhaust but it didn't seem to suck up the dollar...(not extremely noticeable anyway.) Can't seem to find the issue please help. Thanks