When its cold it runs perfect, when its warm it doesnt want to start. It cranks, has spark, It appears to have fuel. This is a TBI model. I just put new spark plugs and fuel injection cleaner to see if I was fouling my plugs. When I took them out they appeared black with soot. Anything else I should be looking for? I was thinking maybe its the fuel pump? When it doesnt start when its acting up like this if I floor it, it will barely run. Then after doing that for a bit I can rev it up fine in nuetral. When I drive it underload it spits and sputters and doesnt wanna run right.