[chevelle_ss_69]

As the weather has been getting colder my grand cherokee has been getting worse. Its a 99 with a 4.0 4wd laredo. In the morning when the vehicle has sat over night, on the way to work the first few stop lights im at, foot on the brake, the rpms begin bouncing down to about 800 and then come back up, sometimes the trans feels light its trying to make the vehicle buck forward even though ive still got my foot on the brake, other times it just doesnt seem to want to go for a second and then kicks in. The vehicle only seems to do that stuff when its cold, after its warmed up itll still do it at a light, the rpms dropping and coming back up, but the trans doesnt seem to flip out like before it got to temp. Any ideas what to look for or where to start?? theres zero codes so says the snap on scanner, and everything seems to look fine from that aspect