1999 Ford Contour 1999 Contour 2.5 Jerking

Shakes or Wobbles problem
1999 Ford Contour 6 cyl Automatic 150000 miles

I recently had work done to the catlytic converters. The car drove fine but the check engine light was on so it wouldn't pass inspection. After having the work done, the car jerks and whistles under the bottom. It does not cut off. The shop did not replace the converters. Instead, they removed the two top 02 sensors, plugged where they were, and put two new ones further down. The mechanic told me that the sensors are feeding off information from the back converter. The car drove fine for two weeks after the work was done. Now it constantly jerks even while coasting.

When I took it back to the shop, they suggested it may be the transmission but inorder to tell, they needed to drop it and take it apart. I declined because there was no problem until they did the work mentioned above. The CEL comes on but the code is for the EGR(?). This code was present before but it was not active.