So I just did a "Pi" swap & the car is running GREAT powerwise but the check engine light comes on & says I have a "random miss". It has new motorcraft plugs & new pep boys brand wires & about 3 month old "scream'n deamon" coils from summit. The car seems to shake a lot around 1000 rpm. Any ideas what this could be? Could it be because I haunt got it tuned yet?