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Most newer four cylinder engines only require the spark plugs for tune-up as wires cap and rotor where eliminated with the advent of direct ignition, hence coil on top of spark plug, other then that standard oil change and new air filter should be all you need..
It sound like your clutch maybe slipping, this would indicate time for replacement, To be sure you could try giving it a little extra gas when you shift, if the RPM's shoot up this would indicate the clutch mabe going bad..How many miles are on the clutch? and How many if any other people drive the vehicle?
does this happen every time or when the vehicle sits for a while? try this...before starting turn key to on position for a few seconds and then off and repeat 3 or for times before starting, listen for the buzz noise of the fuel pump, fuel pump only runs a few seconds untill the engine starts. Listen carefully for it to run and when it stops turn off and the back on listening for pump again, should start right up after 3 or 4 cycles.
Maybe faulty fuel level sending unit of faulty guage cluster or wiring issue
Need more information, engine size, overheating? ect
if it is the front main seal it could cost anywhere from $800-$1500 depending on the shop..not an easy task to replace, the transmission will need to be removed from the vehicle to repair the seal..Although this would be in NY, If you decide to have it fixed you may want to have the axle seals replaced as well while they will already be out to repair the main seal..
unfortunately these engines are known for bad intake manifold gaskets, the coolant in the block is being over pressurized by exhaust gasses escaping into the coolant system, You will need to have the intake gaskets replaced but you may also want to replace the head gaskets as well as they may have been damaged form overheating, but first start with the easient thing and change the thermostat first,if problem continues then proceed to the head and intake gaskets...
start with replacing the purge solenoid under the hood back side of engine bolted to intake manifold, also replace gas cap be sure not to use aftermarket cap they can also not work properly, both parts are pretty cheap at local parts stores
There is no TPS adjustment, it's all built into the electric throttle body...
if a spark plug is cracked this would happen, It happened to me on a 1998 buick regal, same thing car would buck on acceleration but would cruise just fine...other than that I would look at either the mass airflow sensor or throttle body control....