1990 ford f150 dies at idle?

My 1990 ford f150 5.0L v8 5 speed manual just started dying at idle due to low rpms. I've been having other issues with the rpms recently such as them shooting all the way up to 2000 during idle, then it fixed itself and now it's having this problem. And ideas on what it might be?

Since that engine is fuel injected the fuel filter(s) may be clogged especially if using E-fuel.

Bad maf or map sensor would also do it

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