4.0 sohc

2002 ford sport trac 181,000mi on the dash, new engine 58,000mi (still the 4.0 sohc) 2nd owner Spectre air filter 1.5 in wheel spacers Nothing else yet haven’t had for very long wanting to modify it but need to get a tuner first! Any suggestions? What’s good ways to make power on these bad boys...

2008 4.0 sohc with 134,000 miles. I had all the chain tensioners replaced and the oil light is on from idle to about 1700 rpm. Truck runs good with very little engine noise. Before the chain tensioner failure the motor ran great and did not have the oil light problem. The mechanic checked with...