If you are looking specifically for impartial user reviews, I would suggest you head over to Amazon.com and look up the make/ model you are looking for. On the same page should be many reviews for you to read.
Check your ignition coils, Spark plugs, an cables. An batt has to be fully charged! rx7 are not everyday cars, they are high Maintenance!
Check for fuel/spark
Discovered fuel pump is running but there is no spark to the plugs. What now?
Where are the spark plugs on a 2004 mazda rx8?
what is spark plug for mazda tribute 2004
What's the spark plug gap for 2003 Mazda 2300 pic up ?
how do i troubleshoot my 1998 Mazda 626 distributerless no spark
It is important to remember the spark plug gap when changing the spark plugs of a vehicle. A 1998 Mazda B2500 has a spark plug gap of 0.042 to 0.046 inches.
The spark plug gap for a 1996 Mazda Familia should be set between 1.0 and 1.1 mm. This is stated in the adjustment data from Mazda.
What's the gap size for a 1.6 Mazda
The spark plug gap on a 1994 Mazda 1.8L MFI DOHC is .044 (thousandths of an inch)
The spark plug gap on a 2002 Mazda 626 should be set at .044 inches. A new spark plug will come preset from the factory.
there is six spark plugs