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Broken or weak spring on the timing chain tensioner?

Worn out timing chain doesn't seem possible on a Festiva, mine's

never been replaced and just turned 334,000 miles.

I once had a problem with a Chevy Luv that threw me.

It idled perfectly, like a clock, with 120 PSI on all four cyl,

but rev it up any, and it backfired and went back to idle-

Timing chain tensioner problem, they have two tensioners

or guides.....

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Q: While setting timming the timing mark jumps back and forth whats wrong?
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