KJ hesitates at 50 mph during on-ramp. Help
Lately, the car shows some performance degrade. I switched to synthetic oil, changed oil filter, air filter, sparks. I even threw in a Chrevron Techron Fuel System Cleaner and a Lucas Upper Cylinder tuneup in a bottle. The car is now performing a little better but not to the level I want (2005 4x2 130K). Now, when I am on-ramp trying to get to 60 - 65 mph to merge to traffic, the car hesitates/shakes and does not accelerate well. When this happens the speedo reads 45-50 mph. Once it gets to 60, it runs smooth and can get to 80+ easily. I do have the same hesitate/shake problem when I am running on surface street at 50 mph and let loose the gas pedal to either prepare to brake or just to slow down. I am not sure if this has anything to do with the throttle body (serviced at 60K). Any comments?
2014 Grand Cherokee 3.6 Laredo 4x2
2005 Liberty Sport 3.7 4x2 (Sold)