2003 Hyundai Elantra GLS FWD 80,000 mi

2003 Hyundai Elantra gls *check engine light is ON! has code p0303* It’s not spark plug or coil or wire and the cylinder still has good compression, cranks fine and doesn’t stall 129k on miles 2.0 4 cylinder engine Current emissions Clean title in hand Power windows Power locks Heat and ...