Guide :Maintenance & Repair : 2007 Pontiac G6 Base

2007 pontiac G6 tranny slipping with rough idle

This problem just popped up on my girlfriends car in the last week but it got bad quick.  Started with the car almost getting stuck in first and 2nd gear.  It's an automatic transmission.  First though was tranny fluid.  So I planned on topping the fluids in the next day or so.  We went out for dinner about 45 minutes away and the tranny started to slip much worse.  Then check engine light came on.  On the way to the store to get tranny fluid I noticed the car when in idle was idling very rough.  Put half quart of tranny fluid in and it seemed like it was improving but not all the way better.  Then I put the other quart in.We were still an hour from home late at night so not much I could do.  I monitored it on the way home.  Car was driving fine once it got into drive.  But once I was getting down around 40 mph the car was running horrible like it was struggling to down shift.  Got home and the car in idle was still very rough.What's everyone think?  Need more fluid?  Tranny filter?  Car was driving great doing 60-75 mph on highway.  Like I said problems were consisting during idle and when the tranny was down shifting out of drive.  It was also slipping while accelerating from zero.  Would the tranny cause a poor idle?  If it's the fluid being too low how many quarts are needed?  Like I said I only put it one quart.

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