Problems with Topaz 92 and User Manual

Hello everyone I have a problem with my car is a topaz 92 at the top of the engine sounds like iron but only when accelerating when it is in neutral or in parquin the mechanics say that it needs almost an engine adjustment and others do not know what my car is my car is an automatic Topaz and you can also help me I need the user manual I have sought it and nnadie has my email is