so im driving my moms stangs which is a 91 white htbk with a dohc 4 cylinder to the local taco house... while im sitting in the drive through i hear this tick tick tick tick ..... then it got loud as sh** all the sudden like really loud.... so i took it for a quick spin on the freeway and it supddered and shifted irractially ??? made it home but wanna know if any body has any ideas.... also oil pressure gauge looks like its off dosent even move up but then again the tach also reads 4 grand at idle..... so i have no clue please help !!!