Ellsworth

my cars not running as good as it was last fall..

at lower RPM's about 1.5k if I give it a little gas, it hesitates sometimes and backfires.

and at WOT it backfires bad.

I was thinking maybe changing the plug wires (stocks are on 65kmiles)

what are some other things that might be the problem clean the MAF?

normal driving it runs fine, just when going really slow, or WOT it runs poorly.

LS6427

iTrader: (2)

If you have no SES light or codes....something is dirty or clogged. I'd definitely clean the MAF, thats easy and cheap. And a dirty MAF will effect WOT only and cold starts. I'd run a full can of Sea Foam through 1/4 tank of gas, then after thats run out change your fuel filter. Do the plugs (NGK TR55's for $17.00) and new wires from Advance Auto for $36.00.

But a scan with a real dealership type of OBDII scanner might tell you exactly what it is....like a failing 02 sensor(s). Which WILL NOT give you an SES light or code until things are really running shitty or one completey fails.

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THE SHOP

TO be honest start with the mechanical fixes first, throw injector cleaner afterwards to make you feel warm and fuzzy. First check the plugs and go ahead and replace them but inspect each one to see if one is bad enough to cause your issue, wires also. Start there then get back with us.

Ellsworth

At WOT the SES light is flashes for about 15 seconds.

going to change plugs and wires this weekend, and clean the MAF hopefully its an easy fix. Ill have my dad scan for any codes