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I have 99 Grand Caravn. Flex fuel 3.3l. 130k. Very recently had transmission rebuilt.

Engine feels like it is surging when going down road. Also, when idling at stop light, sometimes the engine makes a weird thump sound (you can feel it also). Almost like a miss. No codes are present. Tiook it back to trans. shop. Guy discovered that intake was loose at throttle body. Tightened that and surging seems to have gone away. Now we just have the idle issue.

NOTE: None of these issues were present before trans repair.

Any thoughts? Wife will not stop b!+$&ing about it; need relief!
 

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The occasional 'thump' at idle in gear might be the A/C compressor kicking on? Does it happen with the A/C off?
With a helper holding the brake, see if you can locate the thump under the hood.
 
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