your car has a carburator set up right? if so have it check and cleaned, ganyan talaga sakit ng carburator set up pag luma na. dead na yung digital choke nya, and yung sa aircon mo na may matining na tunog baka dis-aligned yung belts or worned out na. the vibrations are normal kung malamig pa makina but if after 10 mins. meron pa rin. pa check mo mga engine supports mo. baka worned out na rin. i also have a 94 el so i know wjhat you mean. ganyan din naging problem the first few months i bought the car. i already addressed all the problems. medyo magastos tlaga ang second hand car maintenance.