What engines will fit in 1999 jeep grand cherokee laredo 4.0?

No! Years between 1999-2004 are interchangeable.

Try this link
https://www.justanswer.com/jeep/2t1ow-1999-jeep-grand-cherokee-diagonstic-code-p0320-4-0l-engine.html

Plenty of causes. Plugs, valves. rings, numerous electronic/electrical faults. Diagnose vehicle and eliminate problems one by one.

When you say it loses power, do you mean electrical power or engine power ?
You would need to look at the fuse boxes for a loss of electrical power, and use a scanner or code reader to check the computer for trouble codes for a loss of engine power.

all teh smae motors ,hope your fitting a diesel and a manual gearbox ,then its a mans motor

The actual engine assembly will fit but you need to determine if there were any changes made between the two years in the computer or wiring harness. Also make sure that both engines have the exact same transmissions as sometimes the bellhousing patterns are different.
I'm pretty sure yours is a direct replacement though, providing both engines are the same displacement..Most scrapyards have an interchange manual that may help you. (they have to know these things...it's their business)

You didn't post your engine size so please choose the apprpriate diagram:





1989-98 2.5L Engine firing order: 1-3-4-2 Distributor rotation: Clockwise






2.8L Engine firing order: 1-2-3-4-5-6 Distributor rotation: Clockwise





4.0L Engine firing order: 1-5-3-6-2-4 Distributor rotation: Clockwise





5.2L and 5.9L Engine firing order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise

you need a scanner to check for codes

Have the tranny checked out.

• General

General Information VIN 1J4GZ58S4PC121933 VALID Passengers 0 Date 12/12/2008 Year 1993 Doors 0 Invoice $19,195.32 Make Jeep Manual/Auto Trans. No/ No MSRP $21,114.00 Model Grand Cherokee Forced Induction No Delivery $495.00 Trim Laredo FrontWD No Engine Type Straight 6 Cylinder Engine Style 4-Door Laredo 4WD RearWD No Engine Size 4.0L/242 CID Market 4WD Special Purpose Vehicles AllWD No Horsepower Towing 0 - 6,000 FourWD No Torque Fleet Only No Stepside No Fuel Type Gasoline Fuel