previous owner put an after market radio in the car. horn cruise and all radio

yes it would be nice to know that. i will ask for sure and let you know. and i also just found a receipt on the floorand this is what it says "car came in miss fireing. found oilin by spark plugs, valvecoversare warped allowing oil to passby gaskets. car has been overheated. DO NOT recomend driving out of town." the mechanic replaced the coil pack for the ignition. funny thing is this really pisses me off because i told the lady that i drive 40K mile a year from iowa to Virgina,Pennsilvania,South Carolina ECT.should i reconsider taking it to Virgina next saturday? 1000 miles