my grand cherokee is not running right guys ok this is what it does whenever i`m going forward it shakes really bad and when i`m in reverse the motor bogs down like it`s gonna stall help guys i bought it yesterday

 

My 1994 shaked like crazy. The motor mount where bad, I replaced the mount and it fixed it.

 

what i meant was it shakes lurches and runs like crap whenever i`m at a stoplight or backing up and when in reverse the motor bogs down and acts like it wants to stall but it don`t

 

What engine do you have?

 

once you get off from the stop does it smooth out?

 

i got the 4.0 and yeah it smooths out after that

 

any help guys???????

 

It may be the idle air control motor not adjusting the idle speed. If you keep your foot on the gas does it run ok?

 

It's a bit hard without more info:
Does it run smooth in N or park?
Check the transmission fluid levels. Low fluid level will make the trans engage a nd disengage as it runs low on fluid... it will be a voilent shake.
I am not 100% on the auto trans for jeep but it may need adjusting if it trying to pick-up reverse and 1st at the same time (like a trans brake effect)
Or the torque/ stall converter needs some attention.

If it shakes and rattles in park then these last words are useless to you

 

could it be a burnt valve?

 

yeah in park and neutral the shakes stop and when i hit the gas it don`t do it

 

Sounds like a vacuum leak, do you hear any hissing around the intake and vacuum lines?

 

no

 

what else could it be?

 

i found out what it was the plugs were gapped at 0.20 they were supposed to be at 0.35