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If it runs good in park or at idle but is slugish when you try to accelerate it is likely a fuel issue. I would start with a new fuel filter. When you press on the gas you need more fuel pressure and if the pump cant get more through the clogged filter you will get that. If it runs bad even at idle it is likely a spark issue and needs new plugs and wires. I would give it a good tune up - oil change, spark plugs (platinum or iridium), plug wires, air filter, fuel filter, PCV Valve and see how she runs after that.
Thanks for choosing FixYa and welcome. For a tune up, you would need to change spark plugs, coils, distributor cap, coil pack, and wires. You would change the air filter and the fuel filter also. Change your pcv valve as well. You can also change all your fluids and filters, such as oil, coolant fluid, and transmission fluid.
Yes that is one of the first places to start, obviously a full tune up would be desirable, but your probably trying to avoid the costs.
1.New spark plugs
2.Check the resistance of each spark plug lead, as long as all the resistances are similar they willl be ok. if any are quite a bit different change the whole set
3.New air filter element.
4.Change the oil and filter..
5. Possibly a new fuel filter.
the timing and the fuel mixture should not need to be touched
New spark plugs, oil and oil filter, transmission flush and fill, fuel filter, air filter, coolant flush and fill, clean throttle body plate and bore, clean the MAF sensor, replace any loose or cracked vacuum lines, PCV valve, new air filter, new battery.
99% of the time all you should ever need for a tune up is new spark plugs, and a clean air filter and throttle body. But since your inquiry indicated "major" I gave it more critical thought.
This would include your spark plugs or coils, the wires, a new distributor cap, an oil change, air filter, fuel filter, and a coolant flush. A tune up can make a car run like new again. Some don't change the fuel filter on a tune up but I have always said it is best too. They can get clogged up over time.
Just basically spark plugs and an air filter. The plugs don't need replacement until 100,000 miles. The fuel filter is located inside the fuel pump assembly in the gas tank and is not serviceable. It doesn't require a PCV valve and there are no adjustments available for the throttle body, idle or timing.
1)new spark plugs properly gapped.
2)new air filter (check every 35000 miles)
3)new fuel filter (every 35000 miles)
4)1 bottle of STP fuel treatment (red bottle) 4x a year.
5) oil and filter change (castrol or another good quality oil every 3-4000 miles.
6)proper air pressure in tires (check every 2 months
7) service transmission every 40000 miles or less.
New oil and filter
8) new plug wires every 80000 miles.
Take these steps and try a good old fashioned tune up :
1 : Air Filter 2 : Fuel Filter 3 : Spark Plugs 4 : Spark Plug Wires 5 : Oil Change (with new oil filter) 6 : Bottle of Fuel System Cleaner 7 : Quart of oil additive (such as rislone or comparable; helps eliminate any sludge build up)
Take those steps and see if it starts running better. You'd be really surprised at how much of a difference a simple tune up can make.
If this doesn't correct the problem it could be a problem with the throttle adjustment. I believe the Del Sol has a throttle adjuster on it, but I could be wrong. I just can't remember as I've only peered under the hood of a few of these cars. I'd suggest the tuneup though, as a lot of times people tell me that it's like a miracle how much of a change they see in their vehicles after just a simple tune up.