Hi i have a 2003 chevy tailblazer v6

Question

Hi my problem is my car reads
¤Random multiple misfire detected
¤catalyst system efficency below tresholdbank 1
¤evaporative emission system

So when i drive for some reason when i go up a hill the suv slows down . Also when car is off and i turn it on my gas says empty on orange but as i drive it goes back to wear the gas was but seems like when i fill it up it only stays half tank .!any idea what i can be

Answer 1

Having a random misfire (P0300) will shorten the life of the catalytic convertor, with the misfire condition this would rob the engine of power this is would also destroy the catalytic convertor causing it to plug, As for the fuel gauge the Evaporative emission system uses the fuel gauge to determine when Evap would  turn on, this is the reason for the Evaporative emission system fault., Resolve the misfire condition this would include sparkplugs and the sparkplug wires, the fix for the fuel gauge would be the sending unit on the fuel pump.

​ The best place to start for the misfire condition is with the sparkplug, it condition will help pin point the cause for a misfire condition,

​ The fuel gauge sending unit is part of a fuel pump module

 If the catalytic plugs up even partial, this would create a misfire condition and a sluggish condition going uphill