10-11-2009, 08:15 PM
Join Date: Apr 2008
Total Cats: 0
If you've never played with jumping the TEN and GND in the diagnostic box, do a search about "timing advance".
Not sure if I missed it, but have you mentioned anything about how your car drives? ie. does the RPM go up and down like it is when giving it gas when stationary?
Perhaps it's a fuelling issue, or to be price LACK of fuel.
Two things spring to mind:
1) fuel filter need replacing (easy)
2) In-tank fuel pump need replacing (difficult)
Perhaps whenever your engine is dropping RPM's that's when the fuel is not getting to it properly.
Go for a drive and give it a boot-full now and again. If it struggles at high RPM's (over 4,000RPM) then fair chance it's fuel related.
Actually, before you do anything too tricky, rule-out the simplest things;
replace all your spark plugs and leads, and check your air filter.