2004 vy spac ecotec 3.8 rough idle

[lout]

so only tested at idle
if you can have it tested using a scope under load
if not try an inline tester

https://www.repco.com.au/brands/endeavour/endeavour-ignition-spark-tester-inline-da1280/p/A5404229

they add the compression to the spark which may reveal issues

 

[Juniorvsv6ute]

miss just told me the day before the car started running rough the very low fuel warning come up and she put like $20 of E10 in it

 

[Juniorvsv6ute]

so only tested at idle
if you can have it tested using a scope under load
if not try an inline tester

http://[URL]https://www.repco.com.a...gnition-spark-tester-inline-da1280/p/A5404229

[/URL]
they add the compression to the spark which may reveal issues

The inline tester it the one I have and used

 

[lout]

not a fan of ethanol fuels
fill up with 98 and hope for the best

 

[Juniorvsv6ute]

not a fan of ethanol fuels
fill up with 98 and hope for the best

Same and filled it up twice with 98

 

[Pollushon]

It’s still getting spark coils are all good as are plugs and leads and just changed all the injector’s. Runs rough at idle a big flat spot when you take off and every time you put your foot down. It runs rough the hole time, when i hold it at 50kmh the hole car shakes hold it at any Constant speed the hole car shakes. Also running really really rich

Just because it gets spark doesn't mean it's getting the right spark. Ecos are pretty simple animals. In my case on Sunday, plugs held against the engine turning over sparked consistently, just not under running conditions. Consider swapping the 1/4 with the 2/6 and see if the problem moves

Eco's eat up ethanol without a second thought