How important is a tune up or changing spark plugs?

I know changing oil is very important , but my $$ is very tight and my car hit 69,000 miles and I have 2005 PT Cruiser where I have changed the 2 spark plugs that are easy to reach but not the 2 underneath. Can I do damage by not replacing them or just suffer poor gas mileage and performance? ThanksHow important is a tune up or changing spark plugs?
Many vehicles can go over 100,000 miles before the plugs need to be replaced. It won't damage the vehicle to have worn plugs. How did the ones you remove look? If the plug starts to misfire, you will get a check engine light. Spend your money on the things that are really important and can cause damage if neglected. Oil you've been doing, that is important and the other two important items would be your transmission fluid if it's and auto and the timing belts if you have one. Neither of these may be due yet. Check your owner's manual for service intervals.How important is a tune up or changing spark plugs?
its not going to hurt your car if you wait to change them granted you may down the road have a break down related to them not being changed but it will be fine
to start out, the platinum plugs that should have been in there form the beginning, do not have to be changed till about 100,000 miles. replacing only two will not have any ill effects on the engines life span, its not so great on the fuel economy, bu that is about it,
Bad spark plugs can results in a lot of problem;

1. poor starting

2. idle rough

3. poor gas mileage

4. car wont run smoothly

Hope this help!

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