My 1993 Grand Cherokee Laredo L6 4.0 has recently just shut off on a highway from 45 to 0 while rattling and decreases in speed while pushing pedal down.. I then replaced the distributor,distributor cap, plugs,wires,fuel filter, and fuel pump. Now the jeep still doesn't start right, as it takes time at least 2 tries to start. It takes time to accelerate from a stop and shift, mostly taking up to 3 rpm's to shift and it's tough to get up to speed....What could be wrong?

 

You might have a clogged catalytic converter.

 

It makes hard shifts, I narrowed it down to timing problem or belt, crank sensor, or catalytic converter...does a computer diagnosis code these problems?

 

Not really on a 93. OBDI is very basic, nothing like OBDII.

 

plus if it was throwing a code, wouldnt one of the warning lights be on? (cel etc)

 

No check engine light isn't on, so paying for a computer diagnosis wouldn't help me too much?