driveability problems

[mtchll50]

here is the story i am looking at a 91 gsx and when you first start it up it runs smooth when it warms up it starts missing, when you drive it down the road it has a bad miss and bucks all over the place and eveyrtime it bucks the abs light check engine light and a relay behind the radio all comeon and the turn right back off any ideas? i am considering trading either my 84 svo mustang or my 92 5.0 gt convt for it so i wanna try and get some ideas before i make up my mind also the tps sensor the plug is broke so it is loose while it was running at about 2k rpm i pulled the plug off and nothing changed wouldnt that well me there is at least a bad tps sensor

 

[Maglin]

TPS doesn't really do anything for fueling or ignition calcs so no it's probably not bad. All it's really for is to know when it's closed and when the throttle is past a set point to go from closed loop to open loop fueling.

 

[DirtyBirdRacing]

I would check the sparkplugs and the sparkplug wires and give the whole iginition system a good look over.

Bill

 

[DSMcamaro]

I would do a boost leak test and check the engine codes. also, plugs are cheap, as stated above get some new ones. NGK 6's (BPR6ES i believe).