2 shops said I needed a new intake manifold and neither myself or these shops can find one . If I can't fix it to clear the CEL , I can't smog it to sell in California. The truck was running fine for a few months since the CEL came on with the P1537 code , but now it can't idle , but runs ok once at higher RPM. Any ideas? Considering selling as is but California person would need to have smog certificate. Anyone got thought on that . Has 117k miles.