Engine light My engine light is on, and it idles pretty rough. It also loses power sometimes.

the title is contradiction
" check light on, no codes."<< totally wrong
scan it one more time with a REAL scan tool this time. (there are DTC errors , or codes as you said)

what does bad idle mean? misfiring, or idle speed too low
or too high? RPM, or
surging?

say what that means please.
and more important is engine hot or cold ? failing.???? or both????
there are over 50 causes.
but can be broken down to simple physics and gauges.
1: engine bad, lost compression.
2: engine cant breath, dirty air cleaner
3: ISC stuck closed or open or just stuck. (bad idle air supply)
4: bad spark, 1 or all 4 (never had a tune in this decade.
5: cam drive, slipped (belt) causing #1 failure.
6: air fuel mix too lean, and causes rpm drop and ISC fails.
7: air fuel mix too rich and misfires.
8: egr stuck open, it misfires and ISC gives up.
9: cat clogged, engine cant breath #2 like.
10: and the vast other reasons for misfire.

we cant drive it, see it or hear it misfire, so.....????

there is a test for all 10, ask. or get car serviced.

Loss of power, but no mention of rough or inability to idle (including stalling). If those additional symptoms are part of the problem, check for a vacuum leak to the intake. Listen for hissing or sucking noises near air hoses. Look for loose, cracked, or broken air hose connections. Check PCV valve...Cheap to replace, could be sticking, then loosen after truck sitting with engine off. A vacuum leak will not give any light indications, and vehicle will seem to run normal when applying gas, but will want to stall or run rough (or want to stall) when at idle or sometimes when taking foot off gas when slowing down.

My engine is on sometimes and then off. When it is on sometimes it blinks ?????? Check engine light ??????
The flashing light is meant to alert you that you may have a misfire in your engine that will cause catalytic converter damage if you leave the problem unresolved. Replacing a catalytic converter can be costly, so have the engine checked as soon as possible by a certified mechanic.
Don't go to advance auto parts .

ALUMINUM V8 CAMAROS HAVE 3 PROBLEMS
1 VACCUUM LEAKS ie HOSE TO THE pcv deteriorates
2 MASS AIR FLOW / hard to diagnos sometimes
3 COLLANT temp sensor, ie starts fine cold, crappy when warm

Could be low fuel pressure, or a long list of other things.
Is the check engine light on ?
Does it feel like it is running rough, or starving for fuel ?

Hi
1 is the car losing power?
2 is the car rough at idle? or slightly over reving.

If so most likely cause for 2 is the air mass sensor, this go's to the air box you can cleran them with carb cleaner and sometimes this will fix it.

Get back to me for more ingo.

Regards
Dan

seems like bad spark plugs or wires.

maybe coil pac!!!

Check the fuel pump.

Like to other guy said, give it a tuneup. Also try SEAFOAM to clean carb up of slug. Also check to make sure the butter fly for the choke has not come loose, causing it the choke it down. Failed choke pull-off.