No spark at plugs

information that may help someone hot wire a car should not given on the internet

if your nissan wont start normally
why rip wires out ..will end up costing you much more to fix
tow it to a workshop

it will be
if petrol---- fuel or spark ....ecu immobilizer
if a diesel--- glow plugs fuel pump

Replace the spark wires.

Well, there are several basics your engine needs to start: Spark, fuel, compression, and correct valve timing. I am going to assume on good faith that your GT has the 3.4 liter V6. Here are a couple basics on checking fuel and spark:
GM usually puts a schraeder valve (looks like a tire air valve) on the fuel rail. This is where you connect a fuel pressure gauge to test the fuel pressure. It should be 52-59 PSI when you turn the key to run.
If your fuel pressure is good, remove a spark plug wire from one of the front 3 spark plugs. If you have a spark tester, connect it to the removed plug wire. If you don't have a spark tester, remove the spark plug. Plug the removed spark plug or tester into the plug wire. Touch the metal threads of the plug or tester to a good solid metal part of the engine using gloves or non-conducting (plastic) pliers. Have someone try to start the engine. Watch the gap at the end of the spark plug. You should see a bright blue/white spark and hear it snap every time it fires. If you don't, there may not be any spark getting to the engine. Diagnosis of the problem can be far trickier from here on out. You will need to be able to diagnose electrical problems in the fuel/ignition system to find the root cause of no fuel/no spark.

If you cannot hear the fuel pump run in the tank when you turn the key to run, try lightly rapping the bottom of the fuel tank with a hammer turned to its side (don't put a hole in your fuel tank!) while someone cranks the engine over. If the engine starts, most likely cause is a failed fuel pump. Don't expect the car to keep starting on a regular basis if it does start by hitting the tank. The fuel pump will need to be replaced.

Take spark plug out and while plug wire is connected to plug...ground plug to chassis and turn the engine and watch for spark in plug gap.

If you have a spark in the gap...I'd then check fuel system for clogged filter, fuel pump pressure etc.
If you don't have a spark in plug gap...then I'd go to the coil or coil pack depending on the model.

Hope this helps...

does engine start any way, let me know if it will not start

Check for spark; pull the plug fom the coil, place @ 1/4" from grounded metal, crank over and look for spark.

Please let me know wat you find.

Thanks,
Tom

Check if you have spark at the spark plug. Go buy yourself one plug. Take any plug wire off plug in engine. Attach plug wire to new plug and touch a ground on engine with new plug threaded side. Have someone start engine and watch for spark. If spark exsist, look for fuel problem.

check for spark and fuel at the motor! take one of the spark plug wires off and remove the spark plug and put the wire back on it and rest the spark plug on a negitive ground point and have someone try to start it and see if the is spark. to check to see if fuel is getting up there locate the fuel presure relief valve on the fuel rail that the injectors are connected to and while someone it trying to start it depress the valve and see if fuel squirt out.

your cam to crank timing is wrong...recheck it.  Or your spark plug wires are in the wrong places

How do you know it's getting fuel and spark? do you know if the fuel is good? and not watery?
are you getting any check engine light?