Mechanic Job in Chula Vista, California

Hi, i have an 87 e30. It shakes and has veryy little power. like if the car wasent getting gas?. There is no knocking in the engine or white smoke. Ive changed the heater core, fan clutch, basic stuff... oil change spark plugs ect. ajusted the MAF and the car was running REAL GOOD for like 3 weeks... then one night after a drive, i paked it then turned it back on and it just started shaking and seemed to recived very little power, there was no sign of anything wrong beforehand,i just turned it off and when i tured it on it was like that. ive tried to figure it out but i need profesional help. need this done ASAP!!! im in the chula vista area near main st, please txt! 61925416...