Spark problem

When ever I would turn on my car at idle it was at 1500ish when it should be around 750. When ever I gave it gas the car would hesitate and I could hear the exhaust making a popping sound as if it was miss firing. Changed the distributor, spark plugs, wires, head and manifold gasket, camshaft senor and fuel filter. The car ran fine for a day then did the same, I thought the distributor was bad so I sent it back and got another one. Again, it ran fine. And today. A day later. It starting doing the samething. When I give it gas it makes a popping sound as if it was miss firing. I can hear a tish sound around where the distributor is, my dad touched the bottom of the distributor cap and it shocked him pretty bad. And he said it shouldn't and that the cap might be cracked but it's brand new. And when it was running fine for that day it was sucking way more gas then usual if that helps at all. I'm so sick of paying money and it not being fixed. Could it be a electric problem or what? Please help I'm 18, first car. And I don't have money to waste. The car is a probe gt 5speed