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I have a 1997 Saturn SC2. It is the 1.9L DOHC. The car has been doing a few weird things recently. When accelerating from a stop, the RPM’s will drop slightly and then pick back up. It does this when I first start accelerating. It will also do it again before it changes gears. This does not happen all the time. The car is not as responsive as it used to be. Acceleration is slow and is not very responsive. When it does decide to respond it will jerk very badly. Please help me narrow down what this problem could be!
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Assuming you do not have a scan tool and cannot look at live data, first, check the obvious things. Make sure the battery connections are free from corrosion and tight. Make sure the air filter is clean. Look for any visibly damaged, cracked, split, or disconnected vacuum hoses. Check to make sure the spark plug cables have no damage or cracks, and with the engine running watch to see if there are any arcs to ground. You may want to get a fuel pressure test gauge if you do not have one and check the fuel pressure. If you do have a scan tool, look for any stored codes, and the fuel trims and O2 outputs.
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