runs rough when first starts, warmed up runs ok
 

hi ive been havin a problem with my 300 when i start it up and drive right away it studders and has no power and bucks it you step on the gas..when it complely warms up it runs fine tho....any ideas?

what year 300?


if its fine when its warms up my first thing to check would be temp sensors and cold start injector if you have one

its a 1990 and when its cold and i drive it if i push on the press the gas all the way down it bucks and backfires but doesnt go anywere unless i go real light on the gas

I dont remember 100% if the VG30 has cold start injectors but if it dose try unplugging them and see if it still bucks and backfires, also check all the electrical connections for all your temp sensors.