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i currently got my car a diagnostic test and it said i have a huge vacum leak on 1998 Volvo V70

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and speed sensor causing the speedometer to not work.and a huge vacum leak.
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It's common for the intake manifold to leak, but it's also possible the MAF sensor is bad and the computer assumes a very lean running condition. There's not enough info to go on to know for sure. I suggest you take it to a Volvo tech, they will be quite familiar with the issues you are experiencing.
Also, the speedometer issue may be a bad ignition switch or ABS computer, again, have a shop look at this.
Thank you very very much Bret, i appreciate your responce. I wish you and your family a very happy and Merry Merry Christmas and a prosperous New Year!!!!