Spark plugs 3 and 4 have a bad misfire had the intake gasket change still have a misfire.

Question

it has no distributor cap/rotor it is electronic

Answer 1

Did you check the plug wires or ignition coil?  

Answer 2

If this problem is in firing order It's likely in your igniton system and if it's in your cylender alignment you have a burnt head gasket. Simple as that assuming that you have a six cylender motor otherwise I can't advise you.

Answer 3

First would have swapped the plugs with the other cylinders to see if it was the plugs.  If the misfiring moved - then it is the plug.  If misfiring remained, look at the hi tension leads next, or distributor cap or valve adjustment on those 2 cylinders.    Anything else that is surface for those 2 cylinders(like vacuum hoses or cooling or? would be checked) Not the gasket.

Answer 4

Mite have wirers crossed,Or just bad wirers

Answer 5

it might have a couple of bad plug wires or where the wires goes on the distributor cap or coil pack could be corroded.

Answer 6

Most of the cars today have two, three or more coil packs  depending on the number of cylinders your engine has. Check that the coil pack that goes to number 3 and 4 cylinders and see if they are connected to the same coil pack, if both are connected to that coil pack it may have went out. If 3 and 4 plug wires go to different coil packs each, then it probably isn't the coil packs.

Answer 7

Have you changed the spark plugs, wires, and distributor cap/rotor? Cause if the SPARK PLUG is misfiring I'd try that first, instead of an intake gasket...