I have bad mpg and tried all kinds of stuff. This is on my list.
How should I backtrack the problem (if any) anyone got a checklist?
Obviously I changed the spark plug and sparkplug wires, distributor cap and rotor.

 

Check the ignition timing and then change the fuel filter before you do anything else.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kendall &raquo;</TD></TR><TR><TD CLASS="quote">Check the ignition timing and then change the fuel filter before you do anything else.</TD></TR></TABLE>

Done it already.

 

try replace fule filter..air filter?....you know if your running to rich? could be the problem..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lauj87 &raquo;</TD></TR><TR><TD CLASS="quote">try replace fule filter..air filter?....you know if your running to rich? could be the problem..</TD></TR></TABLE>

Did both fuel filter and air filter, tuned to 14.7 except for WOT (open loop)

 

what kinda mods you have on it?

 

Make sure you didn't jump time, meaning your cam gears and crank pulley are in the proper alignment and your timing is correct. Then have your coil and ignitor in the distributor checked. Also make sure your cat conv isnt clogged or failing.

 

O2 sensor? Is that new i've seen cars get horrible mpg because of bad O2 sensors