SES light blinking, idling, and noise from engine

[jelani6428]

so i went to start the car yesterday and had a little trouble cranking but it eventually did.and when it did i heard a hitting noise coming from the engine. after a minute it went away but the car was idling really bad as if it wanted to shut down then i noticed the SES light blinking. i immeadiately shut off the car then restart it. again, it gave a little trouble trynna start but it did, no blinking light this time but it satyed on, and the car is still idling really hard. tookk it around the block and it drives cool until u start slowing down..thats when you feel like it wants to cut off
details- just changed oil. 203,000 miles. replaced head gaskets about 1 year ago. no tune up in about a year. changed all 4 hub assembly couple months ago. any help is grateful.Thanks in advance!!! oh and being that i changed my hubs, why would my trac, anti lock and svs light would still be on...i thought the hubs took care of that?!?!?!