1992 Ford F-150 timing chain replacement kit

I haven't had any luck with finding a new timing chain kit with sprockets etc. For my 92 f150 it is it does hesitate to start sometimes and idles like its missing a little I got a set of motor craft factory gapped spark plugs from oreilly auto I'm going to try that first then gum out if that don't work then fuel filter and tune up I surely don't want to break the chain! And be in more of a rut its a perfect 4.8 in line 6 that don't burn oil. Smells like its maby running a little lean I don't trust aftermarket chains seeing as they don't have a good warrenty but my best luck might be jcwhitney and edelbrock one