Changed spark plugs and wont start now

check spark and fuel 1st take off the air inlet from the airfilter you can shot some gas or brake cleaner or intake cleaner into the throttle area and try to start if starts fuel problem pump, fuses ,gas filter plugged if doesnt start take plug wire off the sparkplug and ground the wire to engine is there spark or not could also be crank sensor or if you have a oil sensor check if full of oil sometimes sensor cuts starting

could be the head gasket has gone take out spark plugs and check there condition and look for water in the piston, water and fuel dont burn well. as you have done an oil change it may have gotten into the oil but its harder to tell with new oil, as water will sit on the top of the oil.

MAINTAINANCE, this is an important word ! an never assume ! tune-up is another, so begin with tune-up, spark plugs, wires, cap / rotor, fuel filter, oil filter, fresh oil, transmission filter /fluid , very important, air filter must be changed also. don't go over 45-50mph until you do all of the above dude. put some drygas in your tank, red bottle, has fuel injector cleaner in it. now get to work !!!!!!!!!!!!!!!!!1

sea foam is a type of foam created by the agitation of seawater,particularly when it contains higher concentrations of dissolved organic matter that will just clogg an block the engine. your head gasket is gone you will need to replace the head gasket an probably flush the engine too... Hope this helps

its could be the fuel pump, if its going bad then it could be causing stall and a gas hose could be bad to and is only allowing a little gas to motor causing it to stall also

MINOR TUNE UP CHECK ALL ENGINE FLUIDS, INSPECT AND TEST BATTERY,CHECK COOLING SYSTEM, CHECK ALL UNDER HOOD HOSES,CHECK AND ADJUST THE DRIVE BELTS, CHECK AIR FILTER. CHECK THE PCV VALVE, INSPECT SPARK PLUG WIRES REPLACE SPARK PLUGS. IF YOU DOING A MAJOR TUNE UP. REPLACE THE AIR FILTER, REPLACE THE SPARK PLUG WIRES AND SPARK PLUGS, REPLACE FUEL FILTER,CHANGE OIL FILTER AND OIL,INSPECT ROTATE TIRES, INSPECT DRIVE AXLE BOOTS,IF YOU HAVE MANUAL TRANSMISSION CHECK OIL LEVEL REPLACE MANUAL TRANSMISSION IF YOU OVER 30000 MILES ,CHECK POWER STEERING SYSTEM, CHECK SUSPENSION SYSTEM,CHECK BRAKE DISCS, PADS, DRUMS AND SHOES,CHECK BRAKE HOSES.CHECK TRANSFERCASE OIL LEVEL,CHECK AUTOMATIC TRANSMISSION FLUID HOSE.CHECK THE EXHAUST SYSTEM.

Change the capacitor inside your distributer, then all should be okay, we all forget this small item until it gives problems it's probably never been changed since vehicle was new. Hope this helps Best wishes, Malcolm Campbell.

Good for you as you already have an idea.

Check your battery and the starter. It's a minor issue.

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Firing sequence is off or plug wires are not connected completely. check the firing order, to the plugs and make sure all connections are on (you will have to push down on top of boot pretty hard to get a good connection)

If it is turing over jump starting isn't gonig to help (you battery if fine unless you have drained all the power from it)

It's a fuse on side of the dashboard--I think its the one (20 amp) on the top left side or close to that area